void random_lookup(node_t node);
void send_find_node(const_node_t node, unsigned int id, unsigned int destination);
-unsigned int send_find_node_to_best(node_t node, const_answer_t node_list);
+unsigned int send_find_node_to_best(const_node_t node, const_answer_t node_list);
void handle_find_node(const_node_t node, const_kademlia_message_t data);