private String combineCellValues(Row row, int cellIndex1, int cellIndex2) {
        String val1 = WorkbookUtil.getCellValueAsString(row.getCell(cellIndex1));
        String val2 = WorkbookUtil.getCellValueAsString(row.getCell(cellIndex2));
        StringBuilder sb = new StringBuilder(val1 == null ? "" : val1.trim());
        if (val2 != null && val2.trim().length() != 0) {
            sb.append(" ").append(val2.trim());
        }
        return sb.toString();
    }