refresh

du4/program.c

@@ -1,5 +1,22 @@
 #include <stdio.h>
 
+
+struct car* add_car (struct car* first, const char* target) {
+
+}
+
+void print_train (struct car* first) {
+
+}
+
+void cancel_train (struct car* first) {
+    
+}
+
+struct car* clear_train(struct car* first, const char* target) {
+    
+}
+
 int main() {
     return 0;
 }