Fir_Tree

using System;

class Program
{
    static void Main()
    {
        int N = 9;
        int nDot = 0;
        int nStar = 0;
        string row = null;

        for (int i = 0; i < N; i++)
        {
            if (i < N - 1)
            {
                nDot = N - i - 2;
                nStar = i;
                row = new string('.', nDot);
                row += new string('*', nStar);
                row += "*";
                row += new string('*', nStar);
                row += new string('.', nDot);
                Console.WriteLine(row);
            }
            else // print ground level
            {
                nDot = N - 2;
                row = new string('.', nDot);
                row += "*";
                row += new string('.', nDot);
                Console.WriteLine(row);
            }
        }
    }
}