Update a1/program.c

a1/program.c

@@ -64,7 +64,7 @@ int main() {
      if (top != -1) {
         char expected = expectedClosing(stack[top]);
         printf("Missing closing brackets: %c\n", expected);
-        return 1;
+        return 0;
     }
 
     printf("All brackets OK\n");