Split binary file by odd/even bytes in Elixir

bin_split.exs

{:ok, binary} = File.read("original.bin")

{f1, f2} = binary
           |> :binary.bin_to_list()
           |> Enum.reduce({"", ""}, fn hex, {f1, f2} ->
             if byte_size(f1) != byte_size(f2) do
               {f1, f2 <> <<hex>>}
             else
               {f1 <> <<hex>>, f2}
             end
           end)

File.write("original_split1.bin", f1, [:binary, :write])
File.write("original_split2.bin", f2, [:binary, :write])
IO.puts("Done!")