code: func Erase(helper Helper, reader io.Reader) error {
  	scanner := bufio.NewScanner(reader)
  
  	buffer := new(bytes.Buffer)
  	for scanner.Scan() {
  		buffer.Write(scanner.Bytes())
  	}
  
  	if err := scanner.Err(); err != nil && err != io.EOF {
  		return err
  	}
  
  	serverURL := strings.TrimSpace(buffer.String())
  	if len(serverURL) == 0 {
  		return NewErrCredentialsMissingServerURL()
  	}
  
  	return helper.Delete(serverURL)
  }
docs: // Erase removes credentials from the store.
  // The reader must contain the server URL to remove.