train

cv5/a_train.c

@@ -37,6 +37,10 @@ void cancel_train(struct car* first) {
     if(first == NULL){
         exit(0);
     }
+    else if(first->next == NULL){
+        free(first->next);
+        exit(0);
+    }
     cancel_train(first->next);
     free(first);
 }