base64, C# - rextester

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using System;
using System.Text;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            String s_data = "RmluYWwtUmVjaXBpZW50OiByZmM4MjI7IGd1YXJhbmFicmFzaWxAZ3VhcmFuYXN0b2NrLmNvbQ0KQWN0aW9uOiBmYWlsZWQNClN0YXR1czogNS4wLjANCkRpYWdub3N0aWMtQ29kZTogc210cDsgVGhlIGVtYWlsIGFjY291bnQgdGhhdCB5b3UgdHJpZWQgdG8gcmVhY2ggZG9lcyBub3QgZXhpc3QuIFBsZWFzZSB0cnkgZG91YmxlLWNoZWNraW5nIHRoZSByZWNpcGllbnQncyBlbWFpbCBhZGRyZXNzIGZvciB0eXBvcyBvciB1bm5lY2Vzc2FyeSBzcGFjZXMuIExlYXJuIG1vcmUgYXQgaHR0cHM6Ly9zdXBwb3J0Lmdvb2dsZS5jb20vbWFpbC8_cD1Ob1N1Y2hVc2VyIG40c29yMzk2MDY5M3dtaC4zNCAtIGdzbXRwDQpMYXN0LUF0dGVtcHQtRGF0ZTogV2VkLCAwNyBNYXIgMjAxOCAwOTo1MToxNiAtMDgwMCAoUFNUKQ0K";
            string converted = s_data.Replace('-', '+');
            converted = converted.Replace('_', '/');
            byte[] data = Convert.FromBase64String(converted);
            string decodedString = Encoding.UTF8.GetString(data);
            Console.WriteLine(decodedString);
        }
    }
}

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Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 15 Mb, average nr of threads: 3