Add C birthday checker example (days until next birthday)

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "(gdb) Bash on Windows Attach",
+            "type": "cppdbg",
+            "request": "attach",
+            "program": "enter program name, for example ${workspaceFolder}/a.exe",
+            "processId": "${command:pickRemoteProcess}",
+            "pipeTransport": {
+                "debuggerPath": "/usr/bin/gdb",
+                "pipeProgram": "${env:windir}\\system32\\bash.exe",
+                "pipeArgs": ["-c"],
+                "pipeCwd": ""
+            },
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                },
+                {
+                    "description": "Set Disassembly Flavor to Intel",
+                    "text": "-gdb-set disassembly-flavor intel",
+                    "ignoreFailures": true
+                }
+            ]
+        },
+        {
+            "name": "(gdb) Attach",
+            "type": "cppdbg",
+            "request": "attach",
+            "program": "enter program name, for example ${workspaceFolder}/a.exe",
+            "MIMode": "gdb",
+            "miDebuggerPath": "/path/to/gdb",
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                },
+                {
+                    "description": "Set Disassembly Flavor to Intel",
+                    "text": "-gdb-set disassembly-flavor intel",
+                    "ignoreFailures": true
+                }
+            ]
+        },
+        {
+            "name": "CMake: CMake Script",
+            "type": "cmake",
+            "request": "launch",
+            "cmakeDebugType": "script",
+            "scriptPath": "${file}"
+        }
+    ]
+}

.vscode/settings.json

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+{
+    "files.associations": {
+        "HBD.C": "cpp"
+    }
+}

.vscode/tasks.json

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+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: gcc.exe build active file",
+            "command": "C:\\MinGW\\bin\\gcc.exe",
+            "args": [
+                "-fdiagnostics-color=always",
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}\\${fileBasenameNoExtension}.exe"
+            ],
+            "options": {
+                "cwd": "${fileDirname}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "detail": "Task generated by Debugger."
+        }
+    ],
+    "version": "2.0.0"
+}

examples/Birthday.c

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+#include <stdio.h>
+#include <time.h>
+
+int main() {
+    int birth_day, birth_month, birth_year;
+    int current_day, current_month, current_year;
+    int age_years, age_months, age_days;
+
+
+    printf("Enter your birth date (DD MM YYYY): ");
+    scanf("%d %d %d", &birth_day, &birth_month, &birth_year);
+
+
+    time_t t = time(NULL);
+    struct tm today = *localtime(&t);
+
+    current_day = today.tm_mday;
+    current_month = today.tm_mon + 1; 
+    current_year = today.tm_year + 1900;
+
+
+    age_years = current_year - birth_year;
+    age_months = current_month - birth_month;
+    age_days = current_day - birth_day;
+
+    if (age_days < 0) {
+        age_days += 30; 
+        age_months--;
+    }
+
+
+    if (age_months < 0) {
+        age_months += 12;
+        age_years--;
+    }
+
+    printf("\nYour Age: %d years, %d months, %d days\n", age_years, age_months, age_days);
+
+    return 0;
+}