In C programming language, write a program that will be used by both patient (Person Under Investigation - PUI) and health care personnel (admin) with different functionality. The PUI should be able to enter their details (PUI ID Card number, name, test date, phone number, email, last known location, address) and the admin should be able to view each PUI details and record test details (PUI ID Card number, location, test status, health care personnel in charge, date, day) for the particular PUI. Once a RT-PCR test is conducted, the PUI will be able to keep track of their test status whether the test was a positive or negative. Test status can be "positive", "negative" or "pending". The admin should be able to view the detail of each test by entering the PUI ID card number. The program should operate continuously until the admin/PUI chooses to exit from the system. You should save all the test details to a file (.txt or .dat).