Spiral Algorithm

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            int size = int.Parse(Console.ReadLine());
            string word = Console.ReadLine();
            char[,] charMatrix = new char[size, size];

            //matrix
            int x = 0;
            int y = 0;

            int currentChar = 0;
            while (size > 0)
            {
                for (int i = y; i <= y + size - 1; i++)
                {
                    charMatrix[x, i] = word[currentChar % word.Length];
                    currentChar++;
                }
                for (int j = x + 1; j <= x + size - 1; j++)
                {
                    charMatrix[j, y + size - 1] = word[currentChar % word.Length];
                    currentChar++;
                }
                for (int i = y + size - 2; i >= y; i--)
                {
                    charMatrix[x + size - 1, i] = word [currentChar % word.Length];
                    currentChar++;
                }
                for (int i = x + size - 2; i >= x + 1; i--)
                {
                    charMatrix[i, y] = word [currentChar % word.Length];
                    currentChar++;
                }
                x = x + 1;
                y = y + 1;
                size = size - 2;
            }
            for (int i = 0; i < charMatrix.GetLength(0); i++)
            {
                for (int j = 0; j < charMatrix.GetLength(1); j++)
                {
                    Console.Write(charMatrix[i,j] + " ");
                }
                Console.WriteLine();
            }
        }
    }
}