diff --git a/cv4/a_train.c b/cv4/a_train.c
index edd3bfb..4be60ce 100644
--- a/cv4/a_train.c
+++ b/cv4/a_train.c
@@ -21,47 +21,47 @@ struct car* add_car(struct car* first,const char* target) {
 }
 
 void print_train(struct car* first) {
-    if(first != NULL){
-        struct car* current = first;
-        while(current->next != NULL){
-            printf("%s\n", current->value);
-            current = current->next;
-        }
-    }
+    // if(first != NULL){
+    //     struct car* current = first;
+    //     while(current->next != NULL){
+    //         printf("%s\n", current->value);
+    //         current = current->next;
+    //     }
+    // }
 }
 
 void cancel_train(struct car* first) {
-    struct car* current = first;
-    while(first != NULL){
-        current = current->next;
-        free(first);
-        first = current;
-    }
+    // struct car* current = first;
+    // while(first != NULL){
+    //     current = current->next;
+    //     free(first);
+    //     first = current;
+    // }
 }
 
 
 struct car* clear_train(struct car* first, const char* target) {
-    if (first = NULL){
-        return NULL;
-    }
-    struct car* current = first, new_first = first;
-    if (first != NULL){
-        if(strcmp(first->destination, target) == 0){
-            new_first = new_first->next;
-            free(first);
-            first = new_first;
-        }
-    }
+    // if (first = NULL){
+    //     return NULL;
+    // }
+    // struct car* current = first, new_first = first;
+    // if (first != NULL){
+    //     if(strcmp(first->destination, target) == 0){
+    //         new_first = new_first->next;
+    //         free(first);
+    //         first = new_first;
+    //     }
+    // }
 
-    while (first->next != NULL) {
-        current = first->next;
-        if (strcmp(current->destination, target) == 0) {
-            first->next = current->next;
-            free(current);
-        } else {
-            first = current;
-        }
-    }
-    return new_first;
+    // while (first->next != NULL) {
+    //     current = first->next;
+    //     if (strcmp(current->destination, target) == 0) {
+    //         first->next = current->next;
+    //         free(current);
+    //     } else {
+    //         first = current;
+    //     }
+    // }
+    // return new_first;
 }