Payroll System

Build a payroll system with the following class hierarchy:

Payable (pure virtual base class): pay() and getRole() are pure virtual.

Staff (inherits from Payable): constructor Staff(string name) stores name as a public member.

FullTimeStaff (inherits from Staff):
- Constructor FullTimeStaff(string name, double monthlySalary)
- pay(): prints "Paying [name]: [salary]"
- getRole(): returns "Full-Time"

ContractStaff (inherits from Staff):
- Constructor ContractStaff(string name, double hourlyRate, int hours)
- pay(): prints "Paying [name]: [hourlyRate * hours]"
- getRole(): returns "Contract"

Do NOT write a main function.