diff --git a/cv4/program.c b/cv4/program.c
index 2fbd360..3ecfbc8 100644
--- a/cv4/program.c
+++ b/cv4/program.c
@@ -1 +1,18 @@
-////////@@@@@@@@@@
\ No newline at end of file
+#include "a_train.h"
+#include <stdio.h>
+
+struct car* add_car(struct car* first,const char* target) {
+    return NULL;
+}
+
+void print_train(struct car* first) {
+}
+
+void cancel_train(struct car* first) {
+}
+
+
+struct car* clear_train(struct car* first, const char* target) {
+	return NULL;
+}
+