example-extension-methods.cs

    public static class HoangExtension
    {
        public static void PlusWithHoang(this string s)
        {
            Console.WriteLine($"{s} - Make from HoangExtension");
        }
    }
   
    class Program
    {
        static void Main(string[] args)
        {
            string s = "I done won a couple Gammys but i sold my soul to get 'em - Lucky - EMINEM";
            s.PlusWithHoang();
        }
    }