clearing cstring

Over a futuremark someone asked how to clear a cstring.
Somone replied use strcpy()
another replied use memset()
i suggested *cString='\0';

what is the perfered method for clearing a cstring?

An empty string is represented by pointer to null character.

clear it to what. Spaces, or null characters?
one would be

Code:

---

for(x=0;x<strlen(string);x++){
    array[x]='\0';
}

---

or if it is a pointer.

Code:

---

pointerarray=NULL;

---

I think he means clear as in destroy, erase, incinerate or make-so-it's-lengt-wold-be-0.

EDIT: linuxdude, why wold anyone want to fill entire string with null characters?

>i suggested *cString='\0';
That would be my choice, unless of course the programmer is trying to destroy the data.