end
  defp normalize_text(stream) do
    stream
    |> Stream.map(&strip/1)
    |> drop_empty()
    |> drop_absurdus()
    |> Stream.map(&remove_special/1)
  end
  defp strip({:line, line}) do
    {:line, String.trim(line)}

  defp strip(skiped), do: skiped
  defp drop_empty(stream) do
    stream
    |> Stream.filter(fn
      {:line, ""} -> false
      _ -> true
    end)
  end
  defp drop_absurdus(stream) do
    stream
    |> Stream.filter(fn
      {:line, line} -> not is_absurdus(line)
      _ -> true
    end)
  end
  defp is_absurdus("*       *       *       *       *"), do: true
  defp is_absurdus("*  *  *  *  *"), do: true
  defp is_absurdus(_), do: false
  defp remove_special({:line, line}) do
    new_line =
      line
      |> String.replace("_", "")
      |> String.replace(~r/\[\d+\]/, "")
    {:line, new_line}
  end
  defp remove_special(skipped), do: skipped