Add play again section after win
Add CFLAGS to Makefile (use C99)
Divide menuSelection function to smaller pieces
Reduce number of variables in main function
Refactor multiplayer function
Separate functions from main.c by adding functions.c and functions.h. Update Makefile.
Add functions.h as a prerequisite of main.o and functions.o
Use smaller array for menu options
Group functions based on MVC approach
Separate functions to files. Introduce constants.h. Update Makefile.
Move multiplayer and singleplayer functions to main.c