namespace lab

{

    internal class Program

    {

        static void Main(string[] args)

        {

            Console.Write("give me your name:");

            string name = Console.ReadLine();

            Console.WriteLine($"{name}_");

            name = name.Trim();

            Console.WriteLine($"{name}_");

            name = name.Replace(" ", "  ");

            Console.WriteLine($"{name}_");

            if (name.Length > 5)

            {

                name = name.Substring(0, 5);

            }

            Console.WriteLine($"{name}_");

        }

    }

}

​