code: func GenerateHalfBlock(text string, l qr.Level, w io.Writer) {
  	config := Config{
  		Level:          l,
  		Writer:         w,
  		HalfBlocks:     true,
  		BlackChar:      BLACK_BLACK,
  		WhiteBlackChar: WHITE_BLACK,
  		WhiteChar:      WHITE_WHITE,
  		BlackWhiteChar: BLACK_WHITE,
  		QuietZone:      QUIET_ZONE,
  	}
  	GenerateWithConfig(text, config)
  }
docs: // Generate a QR Code with half blocks and write it out to io.Writer