code: func ConvertWebPToPNG(data *[]byte) error {
  	r := bytes.NewReader(*data)
  	m, err := webp.Decode(r)
  	if err != nil {
  		return err
  	}
  	var output []byte
  	w := bytes.NewBuffer(output)
  	if err := png.Encode(w, m); err != nil {
  		return err
  	}
  	*data = w.Bytes()
  	return nil
  }
docs: // ConvertWebPToPNG convert input data (which should be WebP format to PNG format)