def sanitize_cells(rows)
      rows.map do |cells|
        cells.map do |cell|
          cell ? cell.strip : ""
        end
      end
    end
def sanitize_cells(rows)
      rows.map do |cells|
        cells.map do |cell|
          cell ? cell.strip : ""
        end
      end
    end
Remove trailing white spaces and ensure we always return a string