diff --git a/.idea/dojo5.iml b/.idea/dojo5.iml
new file mode 100644
index 0000000..25ed3f6
--- /dev/null
+++ b/.idea/dojo5.iml
@@ -0,0 +1,10 @@
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new file mode 100644
index 0000000..15a15b2
--- /dev/null
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@@ -0,0 +1,4 @@
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new file mode 100644
index 0000000..28a804d
--- /dev/null
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new file mode 100644
index 0000000..338ef9a
--- /dev/null
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diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
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new file mode 100644
index 0000000..7e052ff
--- /dev/null
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+    </entry>
+    <entry file="file://$PROJECT_DIR$/kadai1/takafk9/converter/converter_test.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="1740">
+          <caret line="116" column="74" selection-start-line="116" selection-start-column="74" selection-end-line="116" selection-end-column="74" />
+          <folding>
+            <element signature="e#19#57#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/kadai1/takafk9/converter/converter.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="-217">
+          <caret line="32" column="5" selection-start-line="32" selection-start-column="5" selection-end-line="32" selection-end-column="5" />
+          <folding>
+            <element signature="e#19#52#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/kadai1/takafk9/cmd/convert-img-cli/cli.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="587">
+          <caret line="79" column="40" selection-start-line="79" selection-start-column="40" selection-end-line="79" selection-end-column="40" />
+          <folding>
+            <element signature="e#14#63#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/kadai1/takafk9/cmd/convert-img-cli/cli_test.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="480">
+          <caret line="99" column="18" selection-start-line="99" selection-start-column="18" selection-end-line="99" selection-end-column="18" />
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ProjectJDKs.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..42da8f2
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/takafk9/dojo5
+
+go 1.12
diff --git a/kadai1/.idea/encodings.xml b/kadai1/.idea/encodings.xml
new file mode 100644
index 0000000..15a15b2
--- /dev/null
+++ b/kadai1/.idea/encodings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with NO BOM" />
+</project>
\ No newline at end of file
diff --git a/kadai1/.idea/kadai1.iml b/kadai1/.idea/kadai1.iml
new file mode 100644
index 0000000..25ed3f6
--- /dev/null
+++ b/kadai1/.idea/kadai1.iml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/kadai1/.idea/misc.xml b/kadai1/.idea/misc.xml
new file mode 100644
index 0000000..28a804d
--- /dev/null
+++ b/kadai1/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/kadai1/.idea/modules.xml b/kadai1/.idea/modules.xml
new file mode 100644
index 0000000..5652c5f
--- /dev/null
+++ b/kadai1/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/kadai1.iml" filepath="$PROJECT_DIR$/.idea/kadai1.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/kadai1/.idea/vcs.xml b/kadai1/.idea/vcs.xml
new file mode 100644
index 0000000..6c0b863
--- /dev/null
+++ b/kadai1/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/kadai1/.idea/workspace.xml b/kadai1/.idea/workspace.xml
new file mode 100644
index 0000000..b36e5c1
--- /dev/null
+++ b/kadai1/.idea/workspace.xml
@@ -0,0 +1,330 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="b076389b-6a8c-4895-8a9f-69a5789f6cee" name="Default Changelist" comment="" />
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileEditorManager">
+    <leaf>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/takafk9/cmd/convert-img-cli/main.go">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="75">
+              <caret line="5" column="14" selection-start-line="5" selection-start-column="14" selection-end-line="5" selection-end-column="14" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/takafk9/converter/converter.go">
+          <provider selected="true" editor-type-id="text-editor" />
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/takafk9/converter/converter_test.go">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="90">
+              <caret line="12" column="30" selection-start-line="12" selection-start-column="30" selection-end-line="12" selection-end-column="30" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/takafk9/cmd/convert-img-cli/cli.go">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="421">
+              <caret line="89" column="18" selection-start-line="89" selection-start-column="18" selection-end-line="89" selection-end-column="18" />
+              <folding>
+                <element signature="e#14#123#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/takafk9/cmd/convert-img-cli/cli_test.go">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="-407">
+              <caret line="24" column="59" lean-forward="true" selection-start-line="24" selection-start-column="59" selection-end-line="24" selection-end-column="59" />
+              <folding>
+                <element signature="e#14#78#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+    </leaf>
+  </component>
+  <component name="GOROOT" path="$USER_HOME$/.goenv/versions/1.12.4" />
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$/.." />
+  </component>
+  <component name="IdeDocumentHistory">
+    <option name="CHANGED_PATHS">
+      <list>
+        <option value="$PROJECT_DIR$/takafk9/cmd/convert-img-cli/cli.go" />
+        <option value="$PROJECT_DIR$/takafk9/cmd/convert-img-cli/cli_test.go" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectFrameBounds" fullScreen="true">
+    <option name="width" value="1372" />
+    <option name="height" value="1080" />
+  </component>
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectView">
+    <navigator proportions="" version="1">
+      <foldersAlwaysOnTop value="true" />
+    </navigator>
+    <panes>
+      <pane id="ProjectPane">
+        <subPane>
+          <expand>
+            <path>
+              <item name="kadai1" type="b2602c69:ProjectViewProjectNode" />
+              <item name="kadai1" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="kadai1" type="b2602c69:ProjectViewProjectNode" />
+              <item name="kadai1" type="462c0819:PsiDirectoryNode" />
+              <item name="takafk9" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="kadai1" type="b2602c69:ProjectViewProjectNode" />
+              <item name="kadai1" type="462c0819:PsiDirectoryNode" />
+              <item name="takafk9" type="462c0819:PsiDirectoryNode" />
+              <item name="cmd" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="kadai1" type="b2602c69:ProjectViewProjectNode" />
+              <item name="kadai1" type="462c0819:PsiDirectoryNode" />
+              <item name="takafk9" type="462c0819:PsiDirectoryNode" />
+              <item name="cmd" type="462c0819:PsiDirectoryNode" />
+              <item name="convert-img-cli" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="kadai1" type="b2602c69:ProjectViewProjectNode" />
+              <item name="kadai1" type="462c0819:PsiDirectoryNode" />
+              <item name="takafk9" type="462c0819:PsiDirectoryNode" />
+              <item name="converter" type="462c0819:PsiDirectoryNode" />
+            </path>
+          </expand>
+          <select />
+        </subPane>
+      </pane>
+      <pane id="PackagesPane" />
+      <pane id="Scope" />
+    </panes>
+  </component>
+  <component name="PropertiesComponent">
+    <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="aspect.path.notification.shown" value="true" />
+    <property name="go.gopath.indexing.explicitly.defined" value="true" />
+    <property name="go.sdk.automatically.set" value="true" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
+    <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
+    <property name="nodejs_npm_path_reset_for_default_project" value="true" />
+  </component>
+  <component name="RunDashboard">
+    <option name="ruleStates">
+      <list>
+        <RuleState>
+          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
+        </RuleState>
+        <RuleState>
+          <option name="name" value="StatusDashboardGroupingRule" />
+        </RuleState>
+      </list>
+    </option>
+  </component>
+  <component name="RunManager" selected="Go Test.go test takafk9">
+    <configuration name="go build main.go" type="GoApplicationRunConfiguration" factoryName="Go Application" temporary="true" nameIsGenerated="true">
+      <module name="kadai1" />
+      <working_directory value="$PROJECT_DIR$/takafk9" />
+      <kind value="FILE" />
+      <filePath value="$PROJECT_DIR$/takafk9/cmd/convert-img-cli/main.go" />
+      <package value="github.com/takafk9/dojo5/kadai1" />
+      <directory value="$PROJECT_DIR$/" />
+      <method v="2" />
+    </configuration>
+    <configuration default="true" type="GoTestRunConfiguration" factoryName="Go Test">
+      <module name="kadai1" />
+      <working_directory value="$PROJECT_DIR$/" />
+      <go_parameters value="-i" />
+      <framework value="gotest" />
+      <kind value="DIRECTORY" />
+      <package value="github.com/takafk9/dojo5/kadai1" />
+      <directory value="$PROJECT_DIR$/" />
+      <filePath value="$PROJECT_DIR$/" />
+      <pattern value="testall" />
+      <method v="2" />
+    </configuration>
+    <configuration name="go test converter" type="GoTestRunConfiguration" factoryName="Go Test" nameIsGenerated="true">
+      <module name="kadai1" />
+      <working_directory value="$PROJECT_DIR$/" />
+      <go_parameters value="-i" />
+      <framework value="gotest" />
+      <kind value="DIRECTORY" />
+      <package value="github.com/takafk9/dojo5/kadai1" />
+      <directory value="$PROJECT_DIR$/takafk9/converter" />
+      <filePath value="$PROJECT_DIR$/" />
+      <pattern value="testall" />
+      <method v="2" />
+    </configuration>
+    <configuration name="go test takafk9" type="GoTestRunConfiguration" factoryName="Go Test" nameIsGenerated="true">
+      <module name="kadai1" />
+      <working_directory value="$PROJECT_DIR$/takafk9" />
+      <go_parameters value="-i" />
+      <framework value="gotest" />
+      <kind value="DIRECTORY" />
+      <package value="github.com/takafk9/dojo5/kadai1" />
+      <directory value="$PROJECT_DIR$/takafk9" />
+      <filePath value="$PROJECT_DIR$/" />
+      <pattern value="testall" />
+      <method v="2" />
+    </configuration>
+    <list>
+      <item itemvalue="Go Build.go build main.go" />
+      <item itemvalue="Go Test.go test converter" />
+      <item itemvalue="Go Test.go test takafk9" />
+    </list>
+    <recent_temporary>
+      <list>
+        <item itemvalue="Go Build.go build main.go" />
+      </list>
+    </recent_temporary>
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="b076389b-6a8c-4895-8a9f-69a5789f6cee" name="Default Changelist" comment="" />
+      <created>1559719680252</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1559719680252</updated>
+      <workItem from="1559719683055" duration="1725000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TestHistory">
+    <history-entry file="go_test_kadai1 - 2019.06.05 at 16h 58m 51s.xml">
+      <configuration name="go test kadai1" configurationId="GoTestRunConfiguration" />
+    </history-entry>
+    <history-entry file="go_test_kadai1 - 2019.06.05 at 16h 59m 11s.xml">
+      <configuration name="go test kadai1" configurationId="GoTestRunConfiguration" />
+    </history-entry>
+    <history-entry file="go_test_takafk9 - 2019.06.05 at 16h 59m 56s.xml">
+      <configuration name="go test takafk9" configurationId="GoTestRunConfiguration" />
+    </history-entry>
+    <history-entry file="go_test_takafk9 - 2019.06.05 at 17h 00m 40s.xml">
+      <configuration name="go test takafk9" configurationId="GoTestRunConfiguration" />
+    </history-entry>
+    <history-entry file="go_test_converter - 2019.06.05 at 17h 01m 26s.xml">
+      <configuration name="go test converter" configurationId="GoTestRunConfiguration" />
+    </history-entry>
+    <history-entry file="go_test_takafk9 - 2019.06.05 at 17h 01m 39s.xml">
+      <configuration name="go test takafk9" configurationId="GoTestRunConfiguration" />
+    </history-entry>
+  </component>
+  <component name="TimeTrackingManager">
+    <option name="totallyTimeSpent" value="1725000" />
+  </component>
+  <component name="ToolWindowManager">
+    <frame x="0" y="0" width="1920" height="1080" extended-state="0" />
+    <editor active="true" />
+    <layout>
+      <window_info id="Designer" />
+      <window_info id="UI Designer" />
+      <window_info id="Favorites" side_tool="true" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.18603411" />
+      <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
+      <window_info anchor="bottom" id="Docker" />
+      <window_info anchor="bottom" id="Database Changes" />
+      <window_info anchor="bottom" id="Version Control" />
+      <window_info anchor="bottom" id="Messages" />
+      <window_info anchor="bottom" id="Terminal" />
+      <window_info anchor="bottom" id="Event Log" side_tool="true" />
+      <window_info anchor="bottom" id="Message" order="0" />
+      <window_info anchor="bottom" id="Find" order="1" />
+      <window_info anchor="bottom" id="Run" order="2" visible="true" weight="0.049603175" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
+      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
+      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
+      <window_info anchor="bottom" id="TODO" order="6" />
+      <window_info anchor="right" id="Palette" />
+      <window_info anchor="right" id="Maven" />
+      <window_info anchor="right" id="Palette&#9;" />
+      <window_info anchor="right" id="Database" />
+      <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
+      <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
+      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
+    </layout>
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="1" />
+  </component>
+  <component name="VgoProject">
+    <integration-enabled>true</integration-enabled>
+    <proxy>direct</proxy>
+  </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/takafk9/converter/converter.go">
+      <provider selected="true" editor-type-id="text-editor" />
+    </entry>
+    <entry file="file://$PROJECT_DIR$/takafk9/cmd/convert-img-cli/cli.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="421">
+          <caret line="89" column="18" selection-start-line="89" selection-start-column="18" selection-end-line="89" selection-end-column="18" />
+          <folding>
+            <element signature="e#14#123#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/takafk9/converter/converter_test.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="90">
+          <caret line="12" column="30" selection-start-line="12" selection-start-column="30" selection-end-line="12" selection-end-column="30" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/takafk9/cmd/convert-img-cli/main.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="75">
+          <caret line="5" column="14" selection-start-line="5" selection-start-column="14" selection-end-line="5" selection-end-column="14" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/takafk9/cmd/convert-img-cli/cli_test.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="-407">
+          <caret line="24" column="59" lean-forward="true" selection-start-line="24" selection-start-column="59" selection-end-line="24" selection-end-column="59" />
+          <folding>
+            <element signature="e#14#78#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ProjectJDKs.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>
\ No newline at end of file
diff --git a/kadai1/takafk9/.go-version b/kadai1/takafk9/.go-version
new file mode 100644
index 0000000..89c881b
--- /dev/null
+++ b/kadai1/takafk9/.go-version
@@ -0,0 +1 @@
+1.12.4
diff --git a/kadai1/takafk9/.idea/encodings.xml b/kadai1/takafk9/.idea/encodings.xml
new file mode 100644
index 0000000..15a15b2
--- /dev/null
+++ b/kadai1/takafk9/.idea/encodings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with NO BOM" />
+</project>
\ No newline at end of file
diff --git a/kadai1/takafk9/.idea/misc.xml b/kadai1/takafk9/.idea/misc.xml
new file mode 100644
index 0000000..28a804d
--- /dev/null
+++ b/kadai1/takafk9/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/kadai1/takafk9/.idea/modules.xml b/kadai1/takafk9/.idea/modules.xml
new file mode 100644
index 0000000..c888e02
--- /dev/null
+++ b/kadai1/takafk9/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/takafk9.iml" filepath="$PROJECT_DIR$/.idea/takafk9.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/kadai1/takafk9/.idea/takafk9.iml b/kadai1/takafk9/.idea/takafk9.iml
new file mode 100644
index 0000000..d6ebd48
--- /dev/null
+++ b/kadai1/takafk9/.idea/takafk9.iml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/kadai1/takafk9/.idea/vcs.xml b/kadai1/takafk9/.idea/vcs.xml
new file mode 100644
index 0000000..b2bdec2
--- /dev/null
+++ b/kadai1/takafk9/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/kadai1/takafk9/.idea/workspace.xml b/kadai1/takafk9/.idea/workspace.xml
new file mode 100644
index 0000000..d7ac86b
--- /dev/null
+++ b/kadai1/takafk9/.idea/workspace.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="777382a1-5f25-43b9-8717-7b3b0696cd2e" name="Default Changelist" comment="" />
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$/../.." />
+  </component>
+  <component name="ProjectFrameBounds" fullScreen="true">
+    <option name="x" value="730" />
+    <option name="width" value="710" />
+    <option name="height" value="900" />
+  </component>
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectView">
+    <navigator proportions="" version="1">
+      <foldersAlwaysOnTop value="true" />
+    </navigator>
+    <panes>
+      <pane id="Scope" />
+      <pane id="PackagesPane" />
+      <pane id="ProjectPane">
+        <subPane>
+          <expand>
+            <path>
+              <item name="takafk9" type="b2602c69:ProjectViewProjectNode" />
+              <item name="takafk9" type="462c0819:PsiDirectoryNode" />
+            </path>
+          </expand>
+          <select />
+        </subPane>
+      </pane>
+    </panes>
+  </component>
+  <component name="PropertiesComponent">
+    <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="aspect.path.notification.shown" value="true" />
+    <property name="go.gopath.indexing.explicitly.defined" value="true" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
+    <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
+    <property name="nodejs_npm_path_reset_for_default_project" value="true" />
+  </component>
+  <component name="RunDashboard">
+    <option name="ruleStates">
+      <list>
+        <RuleState>
+          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
+        </RuleState>
+        <RuleState>
+          <option name="name" value="StatusDashboardGroupingRule" />
+        </RuleState>
+      </list>
+    </option>
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="777382a1-5f25-43b9-8717-7b3b0696cd2e" name="Default Changelist" comment="" />
+      <created>1559607176225</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1559607176225</updated>
+      <workItem from="1559607179704" duration="453000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TimeTrackingManager">
+    <option name="totallyTimeSpent" value="453000" />
+  </component>
+  <component name="ToolWindowManager">
+    <frame x="730" y="0" width="710" height="900" extended-state="0" />
+    <layout>
+      <window_info id="Designer" />
+      <window_info id="UI Designer" />
+      <window_info id="Favorites" side_tool="true" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.24624625" />
+      <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
+      <window_info anchor="bottom" id="Docker" />
+      <window_info anchor="bottom" id="Database Changes" />
+      <window_info anchor="bottom" id="Version Control" />
+      <window_info anchor="bottom" id="Terminal" />
+      <window_info anchor="bottom" id="Event Log" side_tool="true" />
+      <window_info anchor="bottom" id="Message" order="0" />
+      <window_info anchor="bottom" id="Find" order="1" />
+      <window_info anchor="bottom" id="Run" order="2" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
+      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
+      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
+      <window_info anchor="bottom" id="TODO" order="6" />
+      <window_info anchor="right" id="Palette" />
+      <window_info anchor="right" id="Maven" />
+      <window_info anchor="right" id="Palette&#9;" />
+      <window_info anchor="right" id="Database" />
+      <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
+      <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
+      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
+    </layout>
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="1" />
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ProjectJDKs.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>
\ No newline at end of file
diff --git a/kadai1/takafk9/cmd/convert-img-cli/.go-version b/kadai1/takafk9/cmd/convert-img-cli/.go-version
new file mode 100644
index 0000000..89c881b
--- /dev/null
+++ b/kadai1/takafk9/cmd/convert-img-cli/.go-version
@@ -0,0 +1 @@
+1.12.4
diff --git a/kadai1/takafk9/cmd/convert-img-cli/cli.go b/kadai1/takafk9/cmd/convert-img-cli/cli.go
new file mode 100644
index 0000000..1856647
--- /dev/null
+++ b/kadai1/takafk9/cmd/convert-img-cli/cli.go
@@ -0,0 +1,107 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"github.com/takafk9/dojo5/kadai1/takafk9/converter"
+	"io"
+)
+
+const (
+	ExitCodeOK = iota
+	ExitCodeExpectedError
+	ExitCodeUnexpectedError
+	ExitCodeInvalidArgsError
+	ExitCodeParseFlagsError
+	ExitCodeInvalidFlagError
+)
+
+var usage = `Usage: convert-img-cli [options...] PATH
+
+converter-cli is a command line tool to convert image extension
+
+OPTIONS:
+  --from value, -f value  specifies a image extension converted from (default: .jpg)
+  --to value, -t value    specifies a image extension converted to (default: .png)
+  --help, -h              prints out help
+`
+
+const Name = "convert-img-cli"
+
+var exts = [4]string{".gif", ".jpeg", ".jpg", ".png"}
+
+type CLI struct {
+	outStream, errStream io.Writer
+}
+
+func (cli *CLI) Run(args []string) int {
+	var from string
+	var to string
+
+	flags := flag.NewFlagSet(Name, flag.ContinueOnError)
+	flags.Usage = func() {
+		fmt.Fprint(cli.outStream, usage)
+	}
+
+	flags.StringVar(&from, "from", ".jpg", "")
+	flags.StringVar(&from, "f", ".jpg", "")
+
+	flags.StringVar(&to, "to", ".png", "")
+	flags.StringVar(&to, "t", ".png", "")
+
+	if err := flags.Parse(args[1:]); err != nil {
+		return ExitCodeParseFlagsError
+	}
+
+	if !validateExt(from) {
+		fmt.Fprintf(cli.errStream, "Failed to set up convert-img-cli: invalid extension `%s` is given for --from flag\n"+
+			"Please choose an extension from one of those: %v\n\n", from, exts)
+		return ExitCodeInvalidFlagError
+	}
+
+	if !validateExt(to) {
+		fmt.Fprintf(cli.errStream, "Failed to set up convert-img-cli: invalid extension `%s` is given for --to flag\n"+
+			"Please choose an extension from one of those: %v\n\n", to, exts)
+		return ExitCodeInvalidFlagError
+	}
+
+	path := flags.Args()
+	if len(path) != 1 {
+		fmt.Fprintf(cli.errStream, "Failed to set up convert-img-cli: invalid argument\n"+
+			"Please specify the exact one path to a directly or a file\n\n")
+		return ExitCodeInvalidArgsError
+	}
+
+	files, err := converter.Convert(from, to, path[0])
+	if err != nil {
+		if _, ok := err.(converter.Managed); ok {
+			fmt.Fprintf(cli.errStream, "Failed to execute convert-img-cli\n"+
+				"%s\n\n", err)
+			return ExitCodeExpectedError
+		}
+		fmt.Fprintf(cli.errStream, `conver-img-cli failed because of the following error.
+
+%s
+
+You might encounter a bug with converter-cli, so please report it to https://github.com/xxx/xxxx
+
+`, err)
+
+		return ExitCodeUnexpectedError
+	}
+
+	fmt.Fprintf(cli.outStream, "convert-img-cli successfully converted following files to `%s`.\n", to)
+	fmt.Fprintf(cli.outStream, "%s\n\n", files)
+	return ExitCodeOK
+
+}
+
+func validateExt(ext string) bool {
+	for _, e := range exts {
+		if ext == e {
+			return true
+		}
+
+	}
+	return false
+}
diff --git a/kadai1/takafk9/cmd/convert-img-cli/cli_test.go b/kadai1/takafk9/cmd/convert-img-cli/cli_test.go
new file mode 100644
index 0000000..1498ad4
--- /dev/null
+++ b/kadai1/takafk9/cmd/convert-img-cli/cli_test.go
@@ -0,0 +1,102 @@
+package main
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestCLI(t *testing.T) {
+	cases := []struct {
+		command           string
+		expectedOutStream string
+		expectedErrStream string
+		expectedExitCode  int
+	}{
+		{
+			command:           "convert-img-cli",
+			expectedOutStream: "",
+			expectedErrStream: "Failed to set up convert-img-cli: invalid argument\nPlease specify the exact one path to a directly or a file\n\n",
+			expectedExitCode:  ExitCodeInvalidArgsError,
+		},
+		{
+			command:           "convert-img-cli testdata testdata2",
+			expectedOutStream: "",
+			expectedErrStream: "Failed to set up convert-img-cli: invalid argument\nPlease specify the exact one path to a directly or a file\n\n",
+			expectedExitCode:  ExitCodeInvalidArgsError,
+		},
+		{
+			command:           "convert-img-cli --from .svg",
+			expectedOutStream: "",
+			expectedErrStream: "Failed to set up convert-img-cli: invalid extension `.svg` is given for --from flag\nPlease choose an extension from one of those: [.gif .jpeg .jpg .png]\n\n",
+			expectedExitCode:  ExitCodeInvalidFlagError,
+		},
+		{
+			command:           "convert-img-cli --to .svg",
+			expectedOutStream: "",
+			expectedErrStream: "Failed to set up convert-img-cli: invalid extension `.svg` is given for --to flag\nPlease choose an extension from one of those: [.gif .jpeg .jpg .png]\n\n",
+			expectedExitCode:  ExitCodeInvalidFlagError,
+		},
+		{
+			command:           "convert-img-cli testdata",
+			expectedOutStream: "",
+			expectedErrStream: "Failed to execute convert-img-cli\ncould not find files with the specified extension. path: testdata, extension: .jpg\n\n",
+			expectedExitCode:  ExitCodeExpectedError,
+		},
+		{
+			command:           "convert-img-cli testdata/unknown.jpg",
+			expectedOutStream: "",
+			expectedErrStream: "Failed to execute convert-img-cli\nlstat testdata/unknown.jpg: no such file or directory\n\n",
+			expectedExitCode:  ExitCodeExpectedError,
+		},
+		{
+			command:           "convert-img-cli --from .jpeg testdata",
+			expectedOutStream: "convert-img-cli successfully converted following files to `.png`.\n[testdata/jpeg-image.jpeg]\n\n",
+			expectedErrStream: "",
+			expectedExitCode:  ExitCodeOK,
+		},
+	}
+
+	for i, ca := range cases {
+		outStream := &bytes.Buffer{}
+		errStream := &bytes.Buffer{}
+
+		cli := CLI{outStream: outStream, errStream: errStream}
+		args := strings.Split(ca.command, " ")
+
+		if got := cli.Run(args); got != ca.expectedExitCode {
+			t.Errorf("#%d %q exits with %d, want %d", i, ca.command, got, ca.expectedExitCode)
+		}
+
+		if got := outStream.String(); got != ca.expectedOutStream {
+			t.Errorf("#%d Unexpected outStream has returned: want: %s, got: %s", i, ca.expectedOutStream, got)
+		}
+
+		if got := errStream.String(); got != ca.expectedErrStream {
+			t.Errorf("#%d Unexpected errStream has returned: want: %s, got: %s", i, ca.expectedErrStream, got)
+		}
+
+		remove(t)
+	}
+
+}
+
+func remove(t *testing.T) {
+	t.Helper()
+
+	err := filepath.Walk("testdata", func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if path != "testdata/jpeg-image.jpeg" && path != "testdata" {
+			return os.Remove(path)
+		}
+		return nil
+	})
+
+	if err != nil {
+		t.Errorf("failed to cleanup testdata: %s", err)
+	}
+}
diff --git a/kadai1/takafk9/cmd/convert-img-cli/main.go b/kadai1/takafk9/cmd/convert-img-cli/main.go
new file mode 100644
index 0000000..e3b9d88
--- /dev/null
+++ b/kadai1/takafk9/cmd/convert-img-cli/main.go
@@ -0,0 +1,10 @@
+package main
+
+import "os"
+
+func main() {
+	cli := &CLI{
+		outStream: os.Stdout, errStream: os.Stderr,
+	}
+	os.Exit(cli.Run(os.Args))
+}
diff --git a/kadai1/takafk9/cmd/convert-img-cli/testdata/jpeg-image.jpeg b/kadai1/takafk9/cmd/convert-img-cli/testdata/jpeg-image.jpeg
new file mode 100644
index 0000000..2da5e0d
Binary files /dev/null and b/kadai1/takafk9/cmd/convert-img-cli/testdata/jpeg-image.jpeg differ
diff --git a/kadai1/takafk9/converter/converter.go b/kadai1/takafk9/converter/converter.go
new file mode 100644
index 0000000..bf8e481
--- /dev/null
+++ b/kadai1/takafk9/converter/converter.go
@@ -0,0 +1,117 @@
+package converter
+
+import (
+	"fmt"
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"os"
+	"path/filepath"
+)
+
+// Managed interface represents the error is properly managed and expected
+type Managed interface {
+	Managed() bool
+}
+
+type ManagedError struct {
+	Message string
+}
+
+func (m *ManagedError) Error() string {
+	return m.Message
+}
+
+func (m *ManagedError) Managed()bool{
+	return true
+}
+
+func new()Managed{
+	return &ManagedError{
+		"hoge",
+	}
+}
+
+func Convert(from, to, path string) ([]string, error) {
+	filePaths, err := findFilePaths(from, path)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, filePath := range filePaths {
+		if err := convertImg(to, filePath); err != nil {
+			return nil, err
+		}
+	}
+
+	return filePaths, nil
+}
+
+func findFilePaths(from, path string) ([]string, error) {
+	var filePaths []string
+
+	err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
+		if _, ok := err.(*os.PathError); ok {
+			return &ManagedError{err.Error()}
+		}
+
+		if err != nil {
+			return err
+		}
+
+		if filepath.Ext(path) == from {
+			filePaths = append(filePaths, path)
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	if len(filePaths) == 0 {
+		return nil, &ManagedError{fmt.Sprintf("could not find files with the specified extension. path: %s, extension: %s", path, from)}
+	}
+
+	return filePaths, nil
+
+}
+
+func convertImg(to, filePath string) error {
+	file, err := os.Open(filePath)
+	defer file.Close()
+
+	if err != nil {
+		return err
+	}
+
+	img, _, err := image.Decode(file)
+
+	if err != nil {
+		return err
+	}
+
+	out, err := os.Create(makeFilePath(to, filePath))
+
+	if err != nil {
+		return err
+	}
+
+	switch to {
+	case ".gif":
+		return gif.Encode(out, img, nil)
+	case ".jpeg", ".jpg":
+		return jpeg.Encode(out, img, nil)
+	case ".png":
+		return png.Encode(out, img)
+	default:
+		return fmt.Errorf("unsupported extension is specified: %s", to)
+	}
+}
+
+func makeFilePath(to, filePath string) string {
+	ext := filepath.Ext(filePath)
+	return filePath[:len(filePath)-len(ext)] + to
+}
diff --git a/kadai1/takafk9/converter/converter_test.go b/kadai1/takafk9/converter/converter_test.go
new file mode 100644
index 0000000..c681a87
--- /dev/null
+++ b/kadai1/takafk9/converter/converter_test.go
@@ -0,0 +1,149 @@
+package converter
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+var defaultFile = []string{
+	"testdata",
+	"testdata/empty",
+	"testdata/gif-image.gif",
+	"testdata/gif-image1.gif",
+	"testdata/jpeg-image.jpeg",
+	"testdata/jpeg-image1.jpeg",
+	"testdata/jpg-image.jpg",
+	"testdata/jpg-image1.jpg",
+	"testdata/png-image.png",
+	"testdata/png-image1.png",
+}
+
+func TestConvertImg(t *testing.T) {
+	t.Run("normal", func(t *testing.T) {
+		cases := []struct {
+			from            string
+			to              string
+			path            string
+			expectedFiles   []string
+			expectedOutputs []string
+		}{
+			{
+				from:            ".jpeg",
+				to:              ".png",
+				path:            "./testdata",
+				expectedFiles:   []string{"testdata/jpeg-image.jpeg", "testdata/jpeg-image1.jpeg"},
+				expectedOutputs: []string{"testdata/jpeg-image.png", "testdata/jpeg-image1.png"},
+			},
+			{
+				from:            ".jpeg",
+				to:              ".gif",
+				path:            "./testdata",
+				expectedFiles:   []string{"testdata/jpeg-image.jpeg", "testdata/jpeg-image1.jpeg"},
+				expectedOutputs: []string{"testdata/jpeg-image.gif", "testdata/jpeg-image1.gif"},
+			},
+			{
+				from:            ".png",
+				to:              ".jpeg",
+				path:            "./testdata",
+				expectedFiles:   []string{"testdata/png-image.png", "testdata/png-image1.png"},
+				expectedOutputs: []string{"testdata/png-image.jpeg", "testdata/png-image1.jpeg"},
+			},
+			{
+				from:            ".gif",
+				to:              ".jpeg",
+				path:            "./testdata",
+				expectedFiles:   []string{"testdata/gif-image.gif", "testdata/gif-image1.gif"},
+				expectedOutputs: []string{"testdata/gif-image.jpeg", "testdata/gif-image1.jpeg"},
+			},
+		}
+
+		for i, tc := range cases {
+			files, err := Convert(tc.from, tc.to, tc.path)
+
+			if err != nil {
+				t.Fatalf("#%d converter.Convert returned enexpected error: %s", i, err)
+			}
+
+			if got, want := len(files), len(tc.expectedFiles); got != want {
+				t.Errorf("#%d converter.Convert returnede unexpected number of files: want: %d, got: %d", i, want, got)
+			}
+
+			for _, file := range files {
+
+				ok := false
+				for _, expected := range tc.expectedFiles {
+					if file == expected {
+						ok = true
+					}
+				}
+
+				if !ok {
+					t.Errorf("#%d converter.Convert returned unexpected file: %s", i, file)
+				}
+			}
+
+			for _, expected := range tc.expectedOutputs {
+				if _, err := os.Stat(expected); err != nil {
+					t.Errorf("#%d converter.Convert did not output expected file: %s", i, expected)
+				}
+			}
+
+			remove(t)
+		}
+	})
+
+	t.Run("abnormal", func(t *testing.T) {
+		cases := []struct {
+			from    string
+			to      string
+			path    string
+			managed bool
+		}{
+			{from: ".jpeg", to: ".png", path: "./unknown", managed: true},
+			{from: ".jpeg", to: ".png", path: "./testdata/empty", managed: true},
+			{from: ".svg", to: ".png", path: "./testdata", managed: true},
+			{from: ".jpeg", to: ".png", path: "./unknown.jpeg", managed: true},
+		}
+
+		for i, ca := range cases {
+			_, err := Convert(ca.from, ca.to, ca.path)
+
+			if err == nil {
+				t.Fatalf("#%d error is not supposed to be nil", i)
+			}
+
+			if _, ok := err.(Managed); ok != ca.managed {
+				t.Fatalf("#%d managed is suppoed to be %v. error: %s", i, ca.managed, err)
+			}
+		}
+
+	})
+}
+
+func remove(t *testing.T) {
+	t.Helper()
+
+	err := filepath.Walk("testdata", func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		deletable := true
+		for _, file := range defaultFile {
+			if path == file {
+				deletable = false
+			}
+		}
+
+		if deletable {
+			return os.Remove(path)
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		t.Errorf("failed to cleanup testdata")
+	}
+}
diff --git a/kadai1/takafk9/converter/testdata/gif-image.gif b/kadai1/takafk9/converter/testdata/gif-image.gif
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diff --git a/kadai1/takafk9/converter/testdata/png-image.png b/kadai1/takafk9/converter/testdata/png-image.png
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diff --git a/kadai1/takafk9/converter/testdata/png-image1.png b/kadai1/takafk9/converter/testdata/png-image1.png
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diff --git a/kadai1/takafk9/go.mod b/kadai1/takafk9/go.mod
new file mode 100644
index 0000000..db791b9
--- /dev/null
+++ b/kadai1/takafk9/go.mod
@@ -0,0 +1,3 @@
+module github.com/takafk9/dojo5/kadai1/takafk9
+
+go 1.12