*** hello	80ad86578e12a12c838cd4ff7ca226aa6bcc44e9
--- hello	94ebfe438b30bf18631c1846b2891b818f46aa23
*************** int main()
*** 9,11 ****
--- 9,17 ----
  {
          say_hello();
  }
+ 
+ void say_goodbye()
+ {
+         printf("goodbye\n");
+ }
+