code: func RemoveUser(file, user string) error {
  	passwords, err := ParseHtpasswdFile(file)
  	if err != nil {
  		return err
  	}
  	_, ok := passwords[user]
  	if !ok {
  		return ErrNotExist
  	}
  	delete(passwords, user)
  	return passwords.WriteToFile(file)
  }
docs: // RemoveUser remove an existing user from a file, returns an error, if the user does not \
  // exist in the file