more white to allow renaming

lib/fun_core/basic_signup_whitelist.ex

@@ -1,19 +0,0 @@
-defmodule FunCore.BasicSignupAllowlist do
-  def normalize(email) do
-    email |> String.trim() |> String.downcase()
-  end
-
-  def addresses_as_list(addresses_str) do
-    addresses_str
-    |> String.split(",")
-    |> Enum.map(&normalize/1)
-  end
-
-  def mail_allowlisted_fun(signups_allowed, email_received) do
-    case signups_allowed do
-      nil -> false
-      "*" -> true
-      list_str -> normalize(email_received) in addresses_as_list(list_str)
-    end
-  end
-end