Build a voting system for deciding where to have lunch.

2 types of users: admin and regular users

Admin can input a restaurant and it's lunch menu of the day (2-5 items usually, just a dish name and price)

Menu changes each day (admins do the updates)

Users can vote on which restaurant they want to have lunch at

Only one vote counted per user

If user votes again the same day:

If it is before 11:00 we assume that he changed his mind.

If it is after 11:00 then it is too late, vote can't be changed

Each restaurant provides new menu each day.

Assumptions:

1. Admins can make updates from 11:00am till 11:59pm.
2. Users can vote from 00:01am till 11:00am.