train2

cv5/a_train.c

@@ -32,16 +32,20 @@ void print_train(struct car* first) {
 }
 
 void cancel_train(struct car* first) {   
+    struct car* this;
     if(first == NULL){
         exit(0);
     }
-    if(first->value == NULL){
+    else{
-        //struct car *this = first->next;
+       this = first;
-        free(first);
+       first = this->next;
-    }
+       free(this);
        cancel_train(first->next);
        free(first);
+
     }
+}
+
 
 
 struct car* clear_train(struct car* first, const char* target) {