Copy name to U

function onEdit(e) {
  const sheetName = 'Data';
  const startRow = 5;
  const startColumn = 2;
  const endRow = 28;
  const endColumn = 20;
  const currentRow = e.range.getRow();
  const currentColumn = e.range.getColumn()
  if (e.source.getActiveSheet().getName() == sheetName && typeof e.value == 'string'){
    console.log('Sheet true')
    if (currentRow >= startRow && currentRow <= endRow && currentColumn >= startColumn && currentColumn <= endColumn) {
      console.log('inside range')
      const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName)
      const columnUlastRow = sheet.getRange("U1").getNextDataCell(SpreadsheetApp.Direction.DOWN).getRow()
      sheet.getRange(columnUlastRow+1,21).setValue(e.value)
    }
  }
}