@Override
    public WriteCellData<?> convertToExcelData(WriteConverterContext<String> context) {
        return new WriteCellData<>(context.getValue());
    }
This method is called when writing data to Excel.
(This is not relevant in this context and can be ignored.)

@param context The context containing the Java data to be written.
@return The converted Excel data.
fastexcel-test/src/test/java/cn/idev/excel/test/demo/read/CustomStringStringConverter.java