void print_node(Node* node, int depth)
    {
        if (node->right != nullptr)
        {
            print_node(node->right, depth++);
        }

        std::size_t offset = depth * LEVEL_OFFSET;
        cout << std::string(offset, ' ');

        if (node->left != nullptr)
        {
            print_node(node->left, depth++);
        }
    }