Fix bug in main.c

exit command should go to release_and_exit label, but it went to release_and_continue.

src/main.c

@@ -29,7 +29,7 @@ int main()
         fprintf(stderr, "pwd: Invalid arguments\n");
       }
     } else if (strcmp(argv[0], "exit") == 0) {
-      goto release_and_continue;
+      goto release_and_exit;
     } else {
       fprintf(stderr, "%s: command not found\n", argv[0]);
     }