Repetitive Tasks in C#

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Due to my work being done in C# to automate processes, I needed to do a repetitive task of renaming lots of directories from nnn xxxxxxx.. to xxxxxxxxx, where n represents a digit and x a letter. It's so simple to do. I'm really starting to like the rapid development C# allows for!

Program.cs

using System;

using System.Linq;

namespace FolderRenamer

{

    class Program

    {

        static void Main(string[] args)

        {

            Str s = new Str();

            String dir = "C:\\...\\";

            String[] Files = System.IO.Directory.GetDirectories(dir);

            for (int i=0;i<Files.Count();i++)

                System.IO.Directory.Move(Files[i],dir + s.Convert(s.Cull(Files[i])));

        }

    }

}

Str.cs

using System;

using System.Linq;

namespace FolderRenamer

{

    class Str

    {

        public String Convert(String s)

        {

            return s.Substring(4);

        }

        public static string Reverse(string s)

        {

            char[] charArray = s.ToCharArray();

            Array.Reverse(charArray);

            return new string(charArray);

        }

        public String Cull(String s)

        {

            String n = "";

            for (int i = s.Length - 1; i >= 0 && s[i] != '\\'; i--)

                n += s[i];

            return Reverse(n);

        }

    }

}

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