using System;

​

namespace Y2VC18

{

    public static class Lib

    {

            //if me is shorter than Length, return me as is

            //otherwise shorten the string to to the length parameter

​

            //to check the length of a string me.Length

            //to grab a portion of a string use a method Substring var result = me.Substring(0, 10)

        public static string CapLength(this string me, int length)

        {

            if (me.Length > length)

            {

                return me.Substring(0, length);

            }

            else

            {

                return me;

            }

        }

        public static string ReplaceStudentPlaceholders(this string me, string firstName, string lastName)

        {

            string result = me.Replace("[%SFN%]", firstName).Replace("[%SLN%]", lastName);

            return result;

        }

        public static string ReplaceParentPlaceholders(this string me, string firstName, string lastName)

        {

            string result = me.Replace("[%PFN%]", firstName).Replace("[%PLN%]", lastName);

            return result;

        }

        public static double MultiplyBy3(this double me)

        {

            return me * 3;

        }

​

        public static double Add(double me, double y)

        {

            return me + y;

        }

    }

​

    public class Program

    {

        public static void Main(string[] args)

        {

            string result = "This is a very long string that must be cut off";

            Console.WriteLine(result.CapLength(20));

        }

    }

}

​