code: public static CellStyle cloneCellStyle(Workbook workbook, CellStyle cellStyle) {
  		final CellStyle newCellStyle = workbook.createCellStyle();
  		newCellStyle.cloneStyleFrom(cellStyle);
  		return newCellStyle;
  	}
docs: 克隆新的{@link CellStyle}
  
  @param workbook 工作簿
  @param cellStyle 被复制的样式
  @return {@link CellStyle}