Program Pola Bintang Belah Ketupat dengan C#

using System;

class Program
{
    static void Main(string[] args)
    {
        int rows, i, j, space;

        Console.Write("Masukkan jumlah baris: ");
        rows = Convert.ToInt32(Console.ReadLine());

        space = rows - 1;

        for (j = 1; j <= rows; j++)
        {
            for (i = 1; i <= space; i++)
            {
                Console.Write(" ");
            }

            space--;

            for (i = 1; i <= 2 * j - 1; i++)
            {
                Console.Write("*");
            }

            Console.WriteLine();
        }

        space = 1;

        for (j = 1; j <= rows - 1; j++)
        {
            for (i = 1; i <= space; i++)
            {
                Console.Write(" ");
            }

            space++;

            for (i = 1; i <= 2 * (rows - j) - 1; i++)
            {
                Console.Write("*");
            }

            Console.WriteLine();
        }

        Console.ReadLine();
    }
}