using System;

using System.Collections.Generic;

​

​

public class Program

{

    public static string Main(Guid guid)

    {

        string code = "d29fea06-b075-4e0b-ba88-ac930106117e";

        Guid guid1 = Guid.Parse(code);

        var encoded = Convert.ToBase64String(guid1.ToByteArray());

        encoded = encoded

            .Replace("/", "_")

            .Replace("+", "-");

        Console.WriteLine(encoded.Substring(0, 22));

        return encoded.Substring(0, 22);

    }

}