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