Extracts modules for different sections of the UI

lib/display/notification.ex

@@ -0,0 +1,21 @@
+defmodule Display.Notifications do
+  def congratulate do
+    Colours.green("\nYou have learned much. You must find your own path now.")
+  end
+
+  def invalid_koan(koan, modules) do
+    koans_names = module_names(modules)
+    "Did not find koan #{name(koan)} in " <> koans_names
+  end
+
+  defp module_names(modules) do
+    modules
+    |> Enum.map(&Atom.to_string/1)
+    |> Enum.map(&name/1)
+    |> Enum.join(", ")
+    |> Colours.red
+  end
+
+  defp name("Elixir." <> module), do: module
+  defp name(module), do: name(Atom.to_string(module))
+end