refresh

du4/a_train.c

@@ -58,30 +58,32 @@ void cancel_train (struct car* first) {
 }
 
 struct car* clear_train(struct car* first, const char* target) {
-    if (first == NULL) {
-        return NULL;
-    }
+    struct car* current = first;
+    struct car* previous = NULL;
 
-    struct car* current = first; // текущий вагон
-    struct car* previous = NULL;  // предыдущий вагон
+    while (current != NULL) {
+        if (strcmp(current->value, target) == 0) {
+            struct car* to_delete = current;
 
-    while (current !=NULL) {
-        if (strcmp(current->value, target)==0) {
-            if (previous==NULL) {
-                struct car* new_start = current->next; //Сохраняем адрес второго вагона
-                free(current);
-                current = new_start; //Двигаем курсор на следующий вагон
-                first = new_start; //Обновляем начало поезда
-                continue;
+            
+            if (previous == NULL) {
+                first = current->next;
+                current = first;
             } 
-        } else {
+            else {
                 previous->next = current->next;
-            free(current);
                 current = previous->next;
-            continue;
             }
+
+            free(to_delete);
         } 
+        else {
             previous = current;
             current = current->next;
+        }
+    }
+
+    return first;
 }
 
+