normalize_name

# File actionview/lib/action_view/lookup_context.rb, line 209
      def normalize_name(name, prefixes)
        name = name.to_s
        idx = name.rindex("/")
        return name, prefixes.presence || [""] unless idx

        path_prefix = name[0, idx]
        path_prefix = path_prefix.from(1) if path_prefix.start_with?("/")
        name = name.from(idx + 1)

        if !prefixes || prefixes.empty?
          prefixes = [path_prefix]
        else
          prefixes = prefixes.map { |p| "#{p}/#{path_prefix}" }
        end

        return name, prefixes
      end