二叉树单度节点删除

编写一个函数用于删除二叉树中度为1的所有节点。

要求：节点删除后，其唯一的子节点替代它的位置。

如下：

代码如下，如有问题请指出，谢谢指导：

typedef struct _tag_BTreeNode BTreeNode;
struct _tag_BTreeNode
{
	int data;
	BTreeNode* left;
	BTreeNode* right;
};

void delete_alone_degree(BTreeNode* pRoot)
{
	if (pRoot == NULL)
	{
		return ;
	}

	if ((pRoot->left == NULL) && (pRoot->right == NULL))
	{
		return ;
	}

	if ((pRoot->left == NULL) || (pRoot->right == NULL))
	{
		if (pRoot->left != NULL)
		{
			if ((pRoot->left->left == NULL) && (pRoot->left->right == NULL))
			{
				return ;
			}

			if (pRoot->left->left != NULL)
			{
				BTreeNode *tmp = pRoot->left->left;

				free(pRoot->left);

				pRoot->left = tmp;
				return ;

			}
			else if(pRoot->left->right != NULL)
			{
				BTreeNode *tmp = pRoot->left->right;

				free(pRoot->left);

				pRoot->left = tmp;
				return ;
			}
		}
		else
		{
			if ((pRoot->right->left == NULL) && (pRoot->right->right == NULL))
			{
				return ;
			}

			if (pRoot->right->left != NULL)
			{
				BTreeNode *tmp = pRoot->right->left;

				free(pRoot->right);

				pRoot->right = tmp;

				return ;
			}
			else if (pRoot->right->right != NULL)
			{
				BTreeNode *tmp = pRoot->right->right;

				free(pRoot->right);

				pRoot->right = tmp;

				return ;
			}
		}
	}

	delete_alone_degree(pRoot->left);
	delete_alone_degree(pRoot->right);
	
}