Bitwise Shifting for Strings, C#

Bitwise Shifting for Strings

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static string bitwisestrings(string s1, int s2)
		{
			char[] s1array = s1.ToCharArray();
			char[] endarray = s1array;

char a = (char)5;
			a <<= 3;

string returnstring = "";

for (int i = 0; i < endarray.Length; i++)
			{
				endarray[i] <<= s2;

returnstring += endarray[i];
			}

return returnstring;
			
		}
        
        public static void Main(string[] args)
		{
            string st = "HELLO WORLD, THIS IS A BEAUTIFUL STRING!!!!!! abcdefghijklmnopqrstuvvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            
            int rnd = new System.Random().Next(0, 100);
            
			Console.WriteLine("the String \"" + st + "\" bitshifted to the left by " + rnd + " is \"" + bitwisestrings(st, rnd) + "\".");
		}
    }
}


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