Trying

du4/a_train.c

@@ -63,8 +63,17 @@ struct car* clear_train(struct car* first, const char* target) {
     }
     struct car* prev= first;
     struct car* temp = first->next;
-    while (temp)
-    { 
+    while (prev && temp)
+    { if (strcmp(prev, target) == 0)
+    { struct car* targetNode =prev;
+    prev = temp;
+    temp = temp->next;
+    free(targetNode);
+
+
+        /* code */
+    }
+    
         if(strcmp(temp->value, target) == 0){
          struct car* targetNode = temp;
         prev->next = temp->next;