From b9d90d148d77d6453818dfbc057ae3dee56e794f Mon Sep 17 00:00:00 2001
From: Alina Konoval <alina.konoval@student.tuke.sk>
Date: Thu, 6 Nov 2025 20:58:45 +0100
Subject: [PATCH] du4.2

---
 du4/a_train.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/du4/a_train.c b/du4/a_train.c
index c7970de..62ae2a8 100644
--- a/du4/a_train.c
+++ b/du4/a_train.c
@@ -31,11 +31,15 @@ void print_train(struct car* first) {
 }
 
 void cancel_train(struct car* first) {
-    if (first == NULL) return;
-    cancel_train(first->next);
-    free(first);
+    while (first) {
+        struct car* next = first->next;
+        first->next = NULL;   // ochrana proti cyklom alebo neplatnému next
+        free(first);
+        first = next;
+    }
 }
 
+
 struct car* clear_train(struct car* first, const char* name) {
 
     // Ak je zoznam prázdny