ElixirVN - Exercise

split_case.ex

defmodule App do
  def split_case(str), do: split_case(str, [[], []])

  def split_case(<<char, remain :: binary>>, [upper, lower]) when char < 97 do
    split_case(remain, [[upper, char], lower])
  end
  def split_case(<<char, remain :: binary>>, [upper, lower]) do
    split_case(remain, [upper, [lower, char]])
  end
  def split_case("", [upper, lower]) do
    [
      IO.iodata_to_binary(upper),
      IO.iodata_to_binary(lower)
    ]
  end
end