clear

cv5/a_train.c

@@ -69,7 +69,7 @@ struct car* clear_train(struct car* first, const char* target) {
                 struct car* third = prev->next->next;
                 free(prev->next);
                 prev->next = third; 
-                first->next = NULL;
+                prev->next->next = NULL;
                 return first;
             }
             prev = prev->next;