Merge pull request #56 from danielcft/patch-1

fix 1-12

Author: ohkimur

chapter_1/exercise_1_12/copy_io_nl.c

@@ -1,20 +1,23 @@
 #include <stdio.h>
 
-int main(void)
+int main()
 {
   char c;
+  char last_char = -1;
 
-  while ((c = getchar()) != EOF)
-  {
-    if (c == ' ' || c == '\t' || c == '\n')
-    {
-      putchar('\n');
+  while ((c = getchar()) != EOF) {
+    if((c==' ' ||  c=='\t' ||  c=='\n')) {
+      if(c != last_char) {
+        putchar('\n');
+      }
     }
-    else
-    {
+    else {
       putchar(c);
     }
+
+    last_char=c;
   }
 
   return 0;
 }
+