testing_map.ex

defmodule MyTestScript do
  @h 7
  @fixed_value 37

  def decode(num) do
    decode_internal(num, "")
  end

  defp decode_internal(num, accum) when num == @h do
    String.reverse(accum)
  end

  defp decode_internal(num, accum) do
    conversion_table = %{3 => "e", 1 => "c", 6 => "i", 9 => "n"}
    value = rem(num, @fixed_value)
    next_num = get_next_num(num, value)
    decode_internal(next_num, accum <> Map.get(conversion_table, value))
  end

  defp get_next_num(num, subtraction) do
    trunc((num - subtraction) / @fixed_value)
  end

end

IO.puts(MyTestScript.decode(13583258))