Fix incorrect redirecting behavior

Author: adrien1018

app/controllers/application_controller.rb

@@ -84,9 +84,11 @@ def authenticate_admin!
   def authenticate_user_and_running_if_single_contest!
     if @layout == :single_contest
       authenticate_user!
+      return if performed?
       unless @contest.is_running?
         flash[:alert] = 'Contest is not running.'
         redirect_to single_contest_path(@contest)
+        return
       end
     end
   end

app/controllers/concerns/single_contest_authentication_concern.rb

@@ -31,12 +31,13 @@ def authenticate_user!(opts = {})
     if @layout == :single_contest
       return if user_signed_in?
       redirect_to sign_in_single_contest_path(@contest)
+      return
     end
     super
   end
 
  private
-  
+
   def get_single_contest_user
     user_id = session.dig(:single_contest, @contest.id, :user_id)
     return nil if user_id.nil?