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Can someone make this using apex trigger?

The visit records  same physician are not allowed to overlap with each other.
(For example, if visit #1 is scheduled today on 13:30 and has a timespan of 1 hour, then if visit #2 has a timespan of 30 minutes, it should not be allowed to have a start time at 13: 15 or 14:00, but it can before 13:00 or after 14:30).
When a user creates, updates, or deletes a visit record on Salesforce, the patient receives an email notification letting them know the new time/date of the visit, or that the visit has been canceled.
In addition, every morning at 7:00AM, physicians must receive an email with their scheduled visits of the day.
PriyaPriya (Salesforce Developers) 
Hey Enea,

The developer community recommends providing any attempts/code you've started, any errors you're getting, or where exactly you're struggling in achieving this while posting a question.

Thanks & Regards,

Priya Ranjan