Duplicating a linked list

Linked List Duplication

node duplicateList(node* list)
	{
		node *currentNode = list, *newNode = nullptr, *tempNode = nullptr;
		while (currentNode)
		{
			tempNode = new node;
			tempNode->tag = currentNode->tag;
			tempNode->next = currentNode->next;
			tempNode->random = currentNode->random;
			currentNode = currentNode->next->next;
		}

		currentNode = list;
		while (currentNode && currentNode->next){
			currentNode->next->random = currentNode->random->next;
			currentNode = currentNode->next->next;
		}

		currentNode = list;
		tempNode = nullptr;
		newNode = currentNode->next;
		while (currentNode){
			tempNode->next = currentNode->next;
			tempNode = currentNode->next;
			currentNode->next = currentNode->next->next;
			currentNode = currentNode->next;
		}

		return *newNode;
	}