train2

cv5/a_train.c

@@ -15,8 +15,7 @@ struct car* add_car(struct car* first,const char* target) {
         this = this->next;         
     }
     this->next = newcar;
-    return first;
-   
+    return first;  
 }
 
 void print_train(struct car* first) {
@@ -32,18 +31,15 @@ void print_train(struct car* first) {
     }
 }
 
-
 void cancel_train(struct car* first) {
+    struct car *this = first->next;   
     if(first == NULL){
         exit(0);
     }
-    if(first->next == NULL){
-        struct car *this = first;
-        first = first->next;
-        free(this);
-        exit(0);
+    if(first->value == NULL){
+        free(first);
     }
-    cancel_train(first->next);
+    cancel_train(this->next);
     free(first);
 }