using System;

​

public static class Program

{

    public static void Main()

    {

        Console.WriteLine(obfuscateEmail("phelpsc@advisory.com.au"));

    }

​

    private static string obfuscateEmail(string email)

    {

        if (email.Length < 3 || email.IndexOf('@') == 0)

            return email;

        try

        {

            string prefix = email.Substring(0, 2);

            string suffix = email.Substring(email.IndexOf('@') + 1);

            suffix = suffix.Substring(suffix.LastIndexOf('.') - 1);

            return string.Format("{0}****@****{1}", prefix, suffix);

        }

        catch (Exception)

        {

            return email;

        }

    }

}