Build a meeting room scheduler

• Rooms have an id, name and capacity; addRoom registers them
• book(roomId, start, end, organizer, attendees) creates a booking if the interval is valid (start < end), the room exists, attendees fit within capacity, and it does not overlap any existing booking in that room
• Intervals are half-open, so a booking ending at 10:00 and another starting at 10:00 do not conflict
• findFreeRoom(start, end, minCapacity) returns the smallest room that fits and is free for the whole interval (or all matching rooms ordered by capacity)
• cancel(bookingId) removes a booking, and only the organizer may cancel; roomSchedule(roomId, date) lists bookings for a day sorted by start time
• Booking is atomic with the conflict check, so two requests for the same slot cannot both succeed

Only after every requirement works.

• Recurring bookings (daily and weekly) with conflict detection for every occurrence
• Buffer time between meetings
• Suggest the next available slot for a given duration