code: func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
  	if config == nil {
  		return nil, errors.New("ClouDNS: the configuration of the DNS provider is nil")
  	}
  
  	client, err := internal.NewClient(config.AuthID, config.AuthPassword)
  	if err != nil {
  		return nil, fmt.Errorf("ClouDNS: %v", err)
  	}
  
  	client.HTTPClient = config.HTTPClient
  
  	return &DNSProvider{client: client, config: config}, nil
  }
docs: // NewDNSProviderConfig return a DNSProvider instance configured for ClouDNS.