We're going to build a tool to schedule doctor's appointments. We already have a way to keep track of the patients that need to be scheduled and the doctors that are available along with their addresses in the doctors and patients resources.

For the purposes of this example, the only types of doctors we'll work with are Orthopedists, Opthamologists, and Cardiologists; and we will only treat patients who have broken bones, eye trouble, or heart disease.

You need to do the following:

1. Add a way to keep track of a patient's ailment and a doctor's specialty.
2. Add a way to book appointments for treatment that match doctors to patients ensuring that: a. the doctor's address is within 10 miles of the patient's b. the doctor's specialty is appropriate for the patient's injury c. these appointments are scheduled at least 3 days in the future. d. an email is sent to both the doctor and the patient when the appointment is scheduled with the appointment details including:
   1. doctor's name and address
   2. patient's name
   3. time and date of appointment

Be sure to include adequate tests for all the functionality you add.