static void _ht_node_free_kv(HtKv *kv) {
	free (kv->key);
	//we do not free kv->value because there is other reference 
	free (kv);
}
static void _ht_node_free_kv(HtKv *kv) {
	free (kv->key);
	 
	free (kv);
}