please code Java

Client Server System

A dentist office is currently using paper files to manage all office activities. To make their work easier, the office decided to build a software system to manage those activities instead of using their old paper-way methods. The office patients can take their appointments either by phone or by walking in person to the office lobby. In either way, the receptionist schedules an appointment for the patient with the desired date and time. The system shall not allow scheduling appointments with the same doctor for a duration of less than 30 minutes. Of course, the system shall accept appointments for a specific doctor if the doctor is working on that time. This means that the system shall keep track of each doctor working schedule. The office receptionist enters doctors working schedule in the form of working days for each week. For example, a doctor work schedule can be on Monday, Wednesday, and Thursday from 9:00 am until 4:00 pm for all weeks until June 01, 2021. Now, the office receptionist can cancel a doctor specific day schedule, or group of days, or the entire schedule. If this happens, the system should generate a list of the patients affected by this cancellation, allowing the office receptionist to call them by phone to tell them about this cancellation. Further, the system needs to create a file for each patient upon scheduling first appointment. The system keeps the following information about each patient: name, unique patient number, phone number, owed balance, total of payed balance, email (optional), and details about any previous visits (which each visit should contain description and the cost of that visit). Furthermore, the system shall send reminders by email (if exists) to patients when their appointment is getting closer. Of course, the system should also allow printing a specific visit details.

Assumptions: All operation must be in the server