using System;

public class Program

{

    public static void Main()

    {

        string[] list = new String[]{"a", "b", "c"};

        for(var i = 0; i < list.Length; i++) {

            Console.WriteLine(list[i]);

            Pad(ref list[i]);

            Console.WriteLine(list[i]);

        }

    }

    public static void Pad(ref string s)

    {

        s = s.PadLeft(10, '*');

    }

}