Convert Binary to DLL

#include <bits/stdc++.h> 

struct Node { 
	int data; 
	Node *left, *right; 
}; 

Node* newNode(int data) 
{ 
	Node* node = new Node; 
	node->data = data; 
	node->left = node->right = NULL; 
	return node; 
} 

void BToDLL(Node* root, Node*& head) 
{ 
	if (root == NULL) 
		return; 

	BToDLL(root->right, head); 

	root->right = head; 

	if (head != NULL) 
		head->left = root; 
	head = root; 

	BToDLL(root->left, head); 
} 

void printList(Node* head) 
{ 
	printf("Extracted Double Linked list is:\n"); 
	while (head) { 
		printf("%d ", head->data); 
		head = head->right; 
	} 
} 

int main() 
{ 

	Node* root = newNode(5); 
	root->left = newNode(3); 
	root->right = newNode(6); 
	root->left->left = newNode(1); 
	root->left->right = newNode(4); 
	root->right->right = newNode(8); 
	root->left->left->left = newNode(0); 
	root->left->left->right = newNode(2); 
	root->right->right->left = newNode(7); 
	root->right->right->right = newNode(9); 

	Node* head = NULL; 
	BToDLL(root, head); 

	printList(head); 

	return 0; 
}