create two new files: a friend_server.c file (with a stubbed main function) and a Makefile that compiles a program called friend_server. It must use the gcc flags -g, -std=gnu99, -Wall, and -Werror. In addition to building your code, your Makefile must permit choosing a port at compile-time. To do this, first add a #define to your program to define the port number on which the server will expect connections (this is the port based on your student number):