using System;

using System.Text.RegularExpressions;

​

class Program

{

    static void Main()

    {

        Console.WriteLine(Magic("--fifa-ifes---bcom-webjob-"));

    }

​

    //Regex.Replace(input, "-+", "-") => replaces consecutive) dashes

    //Trim will remove dash from beginning and end of the string

    private static string Magic(string input)

        => Regex.Replace(input, "-+", "-").Trim('-');

}

​