void build_pyramid(int height)
{
    // print row
    for (int i = 0; i < height; i++)
    {
        // print line
        for (int j = 0; j < (height + 2 + (i + 1)); j++)
        {
            if ((j + 1) < (height - i) || j == height || j == (height +1)) printf(" ");
            else printf("#");
        }
        printf("\n");
    }
}