Add intergalactic-transmission exercise

[kahgoh]

This adds the recently added intergalactic-transmission exercise for the Elixir track.

[github-actions]

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Automated comment created by PR Commenter 🤖.

[angelikatyborska]

This is a very fun exercise for a topic that doesn't get a lot of love 🙂 thank you very much!

I'm leaving a few requests for small changes.

[angelikatyborska]

The convention in elixir is that module names should match their filenames. You would need to commit to either to IntergalacticTransmission as the module name and rename this and the test module, or commit to Transmission and rename a bunch of files, as well as the module in the mix.exs file.

[angelikatyborska]

It's possible to solve this exercise without bit operations (see below) so I would remove this import from the stub solution. If people use bit operations, then adding the right import should be part of the practice that they do 😁

  defp parity(bits) do
    list_of_bits =
      bits
      |> Stream.unfold(fn
        <<i::1, r::bitstring>> -> {i, r}
        <<>> -> nil
      end)
      |> Enum.into([])

    Integer.mod(Enum.sum(list_of_bits), 2)
  end

[kahgoh]

Totally agree - that shouldn't have been there 😅.

[kahgoh]

The comments seemed pretty straight forward to me. I've just pushed the updates.

[angelikatyborska]

Thank you 🚀