code: func (w *HTTPProvider) CleanUp(domain, token, keyAuth string) error {
  	err := os.Remove(filepath.Join(w.path, http01.ChallengePath(token)))
  	if err != nil {
  		return fmt.Errorf("could not remove file in webroot after HTTP challenge -> %v", err)
  	}
  
  	return nil
  }
docs: // CleanUp removes the file created for the challenge