#include <string.h>
/*
char* itoa(int n, char* s)
{
  int sign;
  char *ptr;
  ptr = s;
 
  if(n == (int)0x80000000)
    return strcpy(s, "-2147483648");  // overflowed -n
 
  if ((sign = n) < 0) n = -n;
  do {
    *ptr++ = n % 10 + '0';
    } while ((n = n / 10) > 0);
  if (sign < 0) *ptr++ = '-';
  *ptr = '\0';
  return strrev(s);
}
*/