code: def add_download_total(rows):
      
      total_row = [""] * len(rows[0])
      total_row[0] = "Total"
      total_downloads, downloads_column = get_download_total(rows)
      total_row[downloads_column] = str(total_downloads)
      rows.append(total_row)
  
      return rows
docs: Add a final row to rows showing the total downloads