Java remove the formulas but keep the values on Excel worksheet

String inputFile = "Sample.xlsx";
String outputFile="output/removeFormulasButKeepValues_result.xlsx";
//Create a workbook.
Workbook workbook = new Workbook();
//Load the file from disk.
workbook.loadFromFile(inputFile);
//Loop through worksheets.
for (Worksheet sheet : (Iterable<? extends Worksheet>) workbook.getWorksheets())
{
    //Loop through cells.
    for (CellRange cell : (Iterable<? extends CellRange>) sheet.getRange())
    {
        //If the cell contains formula, get the formula value, clear cell content, and then fill the formula value into the cell.
        if (cell.hasFormula())
        {
            Object value = cell.getFormulaValue();
            cell.clear(ExcelClearOptions.ClearContent);
            cell.setValue(value.toString());
        }
    }
}
//Save to file
workbook.saveToFile(outputFile, ExcelVersion.Version2013);