public WriteCellStyle getOrCreateStyle() {
        if (this.writeCellStyle == null) {
            this.writeCellStyle = new WriteCellStyle();
        }
        return this.writeCellStyle;
    }
Returns or creates a new style for the cell.

@return The WriteCellStyle object for the cell.
fastexcel-core/src/main/java/cn/idev/excel/metadata/data/WriteCellData.java