diff --git a/cv4/a_train.c b/cv4/a_train.c
index 8f276b8..6a76c4e 100644
--- a/cv4/a_train.c
+++ b/cv4/a_train.c
@@ -1,5 +1,7 @@
 #include "a_train.h"
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 struct car* add_car(struct car* first,const char* target) {
     struct car* newcar = calloc(1,sizeof(struct car));
@@ -13,10 +15,10 @@ struct car* add_car(struct car* first,const char* target) {
 }
 
 void print_train(struct car* first) {
-    while(first != NULL)(
+    while(first != NULL){
         printf("%s", first->value);
-        first->value = first->next
-    )
+        first = first->next;
+    }
 }
 
 void cancel_train(struct car* first) {