Small fixes for flashing

src/routes/init.rb

@@ -1,3 +1,4 @@
 # frozen_string_literal: true
 
 require_relative 'index'
+require_relative 'message'

src/server.rb

@@ -23,6 +23,10 @@ class Destructo < Sinatra::Base
   require_relative 'helpers'
   helpers Helpers
 
+  # Register flash messages
+  require 'sinatra/flash'
+  register Sinatra::Flash
+
   # Set up our view engine
   set :views, File.join(settings.root, '/../views')