public String formatCellValue(Cell cell) {
        return formatCellValue(cell, null);
    }
<p>
Returns the formatted value of a cell as a <tt>String</tt> regardless of the cell type. If the Excel format
pattern cannot be parsed then the cell value will be formatted using a default format.
</p>
<p>
When passed a null or blank cell, this method will return an empty String (""). Formulas in formula type cells
will not be evaluated.
</p>

@param cell The cell
@return the formatted cell value as a String
fastexcel-test/src/test/java/cn/idev/excel/test/temp/dataformat/DataFormatter1.java