halp (pointers)

i have the following function:

char * find(const char * s1, const char * s2)
{ /* whatever */ }

Inside I move the s2 pointer with *s2++; How do I reset *s2 to point at the beginning of the string? I tried to make a counter and do it like this:

int counters2 = 0;
(later)
*s2++;
counters2++;
(later)
s2-=counters2++;

but it says "cannot modify a const object". What do I do?


(let ((list (list 'a 'b 'c)))
  (setf (car list) (last list)
        (cadr list) (cdr list)))