#include "list.h" void push_front(struct list **l, void *data, acceptor p, acceptor f) { (void)l; (void)data; (void)p; (void)f; } void pop_front(struct list **l) { (void)l; } void print_list(struct list *l) { (void)l; } void destroy_list(struct list **l) { (void)l; }