Write a program to copy a file from a source to destination using POSIX API. Your program should account for the option to copy directories.

Hints:

$$ Include fcntl$.$h

$$ system calls to consider: creat, open, read, write, exit

$$ For directories dirent.h is useful to include, system calls to consider: opendir, readdir

$$ Do not use standard library $($i$.$e$.$ do not include stdlib.h nor use fopen,....etc. This defies the objective of the assignment.