file verification , file list before action

I added 2 new feature to my file editing
1. file verification . The program verify if the file is exist or not.
If file exist  it doesn’t create same file name again or if file
doesn’t exist it doesn’t it tell the file is not exist to delete.
2. before entering a file name you can list files with ending .txt now
on.
holly shit i can code in 20 days!!!