#!/usr/bin/env elixir

defmodule Nemui do

  @nemui ~w(ね む い)

  def nemui(acc \\ "")

  def nemui(acc) do
    if String.ends_with?(acc, "ねむい") do
      IO.puts acc
    else
      nemui(acc <> zzz())
    end
  end

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

Nemui.nemui()