LAC is all talk and no action

A troll or an incompetent?
I don't know!

Why do people redefine NULL?

#undef NULL
#define NULL (void *)0
Or just
#include <stdlib.h>
#define null ((void *)0)

Why? Why the hell would anyone do that? The only reason I can think of is if you want to make your own libc. No idea why anyone would do the second example.