#!/usr/bin/env elixir

defmodule Nemui do

  @nemui ~w(ね む い)
  e = String.ends_with?/2

  def nemui(acc \\ "")

  def nemui(acc) when e(acc, "ねむい") do
      IO.puts acc
  end

  def nemui(acc) do
    nemui(acc <> zzz())
  end

  def zzz() do
    @nemui
    |> Enum.take_random(1)
    |> List.first
  end
end

Nemui.nemui()