simplify logic

Author: danielcft

chapter_1/exercise_1_12/copy_io_nl.c

@@ -6,16 +6,18 @@ int main()
   char last_char = -1;
 
   while ((c = getchar()) != EOF) {
-    if(c==' ' || c=='\t' ||  c=='\n'){
-      if(last_char!=' ' &&  last_char!='\t' && last_char!='\n'){
+    if((c==' ' ||  c=='\t' ||  c=='\n')) {
+      if(c != last_char) {
         putchar('\n');
       }
     }
     else {
       putchar(c);
     }
+
     last_char=c;
   }
 
   return 0;
 }
+