new_contents: from tkinter.filedialog import askopenfilename, asksaveasfilename
  
  from usernamer import usernamer
  
  print("Batch process usernames....")
  
  student_db_file = askopenfilename()
  username_db_file = asksaveasfilename()
  print("Student File: ", student_db_file)
  print("Save as File: ", username_db_file)
  student_db = open(student_db_file, "r")
  username_db = open(username_db_file, "w")
  
  for line in student_db:
      first_name, last_name = line.split()
      uname = usernamer(first_name, last_name)
      print(uname, file=username_db)
  
  student_db.close()
  username_db.close()
  
  print("Done processing.")
  
subject: Add batch that uses usernamer.