void btr_del_node(struct btr_node *btrn);
void btr_add_output(char *buf, size_t size, struct btr_node *btrn);
bool btr_is_leaf_node(struct btr_node *btrn);
void btr_del_node(struct btr_node *btrn);
void btr_add_output(char *buf, size_t size, struct btr_node *btrn);
bool btr_is_leaf_node(struct btr_node *btrn);