Implement message delete method

app/controllers/messages_controller.rb

@@ -1,8 +1,11 @@
 class MessagesController < ApplicationController
-  allow_unauthenticated_access
-  skip_before_action :verify_authenticity_token
+  skip_before_action :verify_authenticity_token, only: %i[ create ]
+
+  before_action :set_contest, only: %i[ destroy ]
+  before_action :set_message, only: %i[ destroy ]
 
   def create
+    allow_unauthenticated_access
     skip_authorization
 
     @message_params = message_params
@@ -19,6 +22,23 @@ class MessagesController < ApplicationController
     end
   end
 
+  def destroy
+    authorize @contest
+
+    @message.destroy
+    redirect_to contest_path(@contest)
+  end
+
+  private
+
+  def set_contest
+    @contest = Contest.find(params[:contest_id])
+  end
+
+  def set_message
+    @message = Message.find(params[:id])
+  end
+
   def message_params
     params.expect(message: [ :text, :time_seconds, :token ])
   end