This program simulates the backend of a ticket purchasing system

Price per visitor is $5; Price per member is $3.50

You are to do the following

1. Identify all banned visitors with a filter call
2. Determine the memberships status of all applicants
3. Calculate the total price for all eligible visitors
4. For each valid visitor, return a corresponding ticket in Dictionary form
5. Return an error via thrown exception if applicants is empty

Complete everything above in a function called processRequest