reverse.c

/* reverse: reverse string s in place */
void reverse(char *s)
{ 
  int j = 0;
  int temp = 0;
  char *i = s;

  s += strlen(s) - 1;

  while (s != i){
    temp = *i;
    *i = *s;
    *s = temp;
    i++, s--;
  }
}