train2

cv5/a_train.c

@@ -32,14 +32,14 @@ void print_train(struct car* first) {
 }
 
 void cancel_train(struct car* first) {   
-    struct car *this = first->next;   
     if(first == NULL){
         exit(0);
     }
     if(first->value == NULL){
+        //struct car *this = first->next;
         free(first);
     }
-    cancel_train(this->next);
+    cancel_train(first->next);
     free(first);
 }