revert mian.c change

Author: shenxianpeng

testing/main.c

@@ -1,6 +1,2 @@
 #include <stdio.h>
-int main() {
-  for (;;) break;
-  printf("Hello world!\n");
-  return 0;
-}
+int main() {for (;;) break; printf("Hello world!\n");return 0;}