______MAIN________
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Diagnostics;
using System.Threading;
using System.Text.RegularExpressions;

namespace BatchRenamer
{
    class Program
    {
        static void Main(string[] args)
        {
            int meme;
            string directory = @"C:\Users\Cyanisyde\Desktop\testfolder";
            FileHandler fG = new FileHandler(directory);
            //FileHandler[] allFilesInFolder = fG.fetchFiles(directory);
            Flow flow = new Flow();

            flow.showFolderContent(fG.fetchFiles(directory));

            Thread.Sleep(2000);
            Console.Clear();

            foreach (FileInfo file in fG.fetchFiles(directory))
            {
                if (file.ToString().EndsWith(".flac"))
                {
                    Debug.WriteLine("LENGTH = " + file.ToString().Length);
                    Debug.WriteLine("INDEX = " + file.ToString().LastIndexOf("-"));
                    meme = file.ToString().LastIndexOf("-") + 2 + file.ToString().Length - file.ToString().LastIndexOf("-") - 1;
                    Debug.WriteLine("XDD = " + meme);
                    string newName = file.ToString().Substring(file.ToString().LastIndexOf("-")+2, (int)file.ToString().Length - (int)file.ToString().LastIndexOf("-") - 2);
                    File.Move(file.FullName, Path.Combine(directory, newName));
                }
            }



            Console.ReadKey();


        }
    }
}



_____FLOW.CS_____
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace BatchRenamer
{
    public class Flow
    {

        public void showFolderContent(FileInfo[] allFiles)
        {
            for (int i = 0; i < allFiles.Length; i++)
            {
                Console.WriteLine(allFiles[i]);
            }
        }


    }
}



______FILEHANDLER.CS________
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Diagnostics;

namespace BatchRenamer
{
    public class FileHandler
    {
        string directoryName;
        List<string> folderFiles = new List<string>();


        public FileHandler(string directoryName)
        {
            this.directoryName = directoryName;
        }


        public FileInfo[] fetchFiles(string directoryName)
        {
            DirectoryInfo d = new DirectoryInfo(directoryName);
            FileInfo[] files = d.GetFiles("*");

            //for (int i = 0; i < files.Count(); i++)
            //{
            //    folderFiles.Add(files[i].ToString());
            //}
            //return folderFiles;
            return files;
        }




    }
}