Write a C program prime that uses a brute force approach to find prime numbers.

prime needs to keep track of the largest prime number found so far.

Use the signal() function to provide a custom handler for the SIGINT signal.

When Ctrl-C is pressed, prime needs to do the following:

Print the largest prime number found so far;

Prompt the user whether to quit;

Accept exactly one character as the input without requiring the user to press Enter;

Quit if the user presses y or Y.