@Override
    public WriteFont clone() {
        WriteFont writeFont = new WriteFont();
        writeFont.setFontName(getFontName());
        writeFont.setFontHeightInPoints(getFontHeightInPoints());
        writeFont.setItalic(getItalic());
        writeFont.setStrikeout(getStrikeout());
        writeFont.setColor(getColor());
        writeFont.setTypeOffset(getTypeOffset());
        writeFont.setUnderline(getUnderline());
        writeFont.setCharset(getCharset());
        writeFont.setBold(getBold());
        return writeFont;
    }
The source is not empty merge the data to the target.

@param source source
@param target target
fastexcel-core/src/main/java/cn/idev/excel/write/metadata/style/WriteFont.java