12-binary_tree_leaves.c

#include "binary_trees.h"

/**
 * binary_tree_leaves - Counts the leaves in a binary tree.
 * @tree: Pointer to the root node of the tree to count the number of leaves.
 * Return: Number of leaves. If tree is NULL, return 0.
*/
size_t binary_tree_leaves(const binary_tree_t *tree)
{
	if (tree == NULL)
	{
		return (0);
	}
	if (tree->left == NULL && tree->right == NULL)
	{
		return (1);
	}

	return (binary_tree_leaves(tree->left) + binary_tree_leaves(tree->right));
}