Program Rewrite the line-reversing function to use pointers.

int reverse(char *string)
{
 char *lp = string;   /* left pointer */
 char *rp = &string[strlen(string)-1]; /* right pointer */
 char tmp;
 while(lp < rp)
  {
  tmp = *lp;
  *lp = *rp;
  *rp = tmp;
  lp++;
  rp--;
  }
 return 0;
}