clone method

Implementation

@override
FastResponseAd clone() {
  return FastResponseAd(
    merchant: merchant?.clone(),
    ranking: ranking?.clone(),
    description: description,
    video: video?.clone(),
    image: image.clone(),
    language: language,
    discount: discount,
    button: button,
    price: price,
    title: title,
    url: url,
  );
}