18-binary_tree_uncle.c

#include "binary_trees.h"

/**
 * binary_tree_uncle - Finds the uncle of a node
 *
 * @node: Pointer to the node to find the uncle
 * Return: NULL if node is NULL, NULL if node has no uncle
 */
binary_tree_t *binary_tree_uncle(binary_tree_t *node)
{
	if (!node || !node->parent)
		return (NULL);

	return (binary_tree_sibling(node->parent));
}

/**
 * binary_tree_sibling - Finds the sibling of a node
 *
 * @node: Pointer to the node to find the sibling
 * Return: NULL if node or parent is NULL, NULL if node has no sibling
 */
binary_tree_t *binary_tree_sibling(binary_tree_t *node)
{
	if (!node || !node->parent)
		return (NULL);

	if (node == node->parent->left)
		return (node->parent->right);

	return (node->parent->left);
}