code: func StringFind(s, token string) (remainder string, found bool) {
  	i := strings.Index(s, token)
  	if i == -1 {
  		return s, false
  	}
  	return s[i+len(token):], true
  }
docs: // StringFind returns in found if token has been found in s,
  // and returns the remaining string afte token in remainder.
  // The whole string s will be returned if found is false.