defmodule AoC.Util.String do
  @doc """
  Transposes the string when it represents
  a grid of newline separated rows where each
  character is a new column.

  iex> AoC.Util.String.transpose(
  iex>  ~s(abc
  iex>def
  iex>ghi)
  iex>)
  ~s(adg
  beh
  cfi)
  """
  def transpose(str) do
    AoC.Util.Enum.transpose(
      str
        |> String.split("\n")
        |> Enum.map(&String.graphemes(&1))

    )|> Enum.map(&Enum.join(&1,"")) |> Enum.join("\n")
  end
end