strtok(const string[], &index)
{
  new length = strlen(string);
  while ((index < length) && (string[index] <= ' '))
  {
   index++;
  }

  new offset = index;
  new result[20];
  while ((index < length) && (string[index] > ' ') && ((index - offset) < (sizeof(result) - 1)))
  {
   result[index - offset] = string[index];
   index++;
  }
  result[index - offset] = EOS;
  return result;
}