# lib.h

descibe what you are doing, describe about functions

#ifndef DEQUE_H
#define DEQUE_H

write down the includes here


desicribe each function (what it returs or what it manipulates)

define fuction and typedef here

#endif


# lib.c

include <lib.h> file

write down the structures and functions here

comment down if its a complex step and does need a little more understanding


# main.c

write down the driver program

include "lib.h" file

check all the functions here


compile it with gcc main.c lib.c (that will work)