public static void merge(DataFormatData source, DataFormatData target) {
        if (source == null || target == null) {
            return;
        }
        if (source.getIndex() != null) {
            target.setIndex(source.getIndex());
        }
        if (StringUtils.isNotBlank(source.getFormat())) {
            target.setFormat(source.getFormat());
        }
    }
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/metadata/data/DataFormatData.java