Stars

using System;

namespace ConsoleApp2
{
    public class Program
    {
        public static void Main()
        {
            int length = int.Parse(Console.ReadLine());
            string star = "* ";
            string whiteSpace = " ";

            PrintTriangleUp(length, star, whiteSpace);
            PrintTriangleDown(length, star, whiteSpace);
        }

        public static void PrintTriangleUp(int length, string star, string whiteSpace)
        {
            int whiteSpaceLength = length - 1;

            for (int i = 1; i <= length; i++)
            {
                PrintWhiteSpace(whiteSpaceLength, whiteSpace);
                whiteSpaceLength -= 1;
                PrintStars(i, star);

                Console.WriteLine();
            }
        }

        public static void PrintTriangleDown(int length, string star, string whiteSpace)
        {
            length -= 1;
            int whiteSpaceLength = 1;

            for (int i = length; i >= 0; i--)
            {
                PrintWhiteSpace(whiteSpaceLength, whiteSpace);
                whiteSpaceLength += 1;
                PrintStars(i, star);

                Console.WriteLine();
            }
        }

        public static void PrintWhiteSpace(int whiteSpaceLength, string whiteSpace)
        {
            for (int i = 0; i < whiteSpaceLength; i++)
            {
                Console.Write(whiteSpace);
            }
        }

        public static void PrintStars(int starsLength, string star)
        {
            for (int i = 0; i < starsLength; i++)
            {
                Console.Write(star);
            }
        }
    }
}