code: public File save(@NonNull String path) {
      try {
        FileOutputStream out = new FileOutputStream(path);
        workbook.write(out);
        out.close();
      } catch (IOException e) {
        log.error(null, e);
        throw new RuntimeException(e);
      }
      return new File(path);
    }
docs: Saves this {@link WorkbookWriter} to a file.
  
  @param path
  of the output file
  @return saved File