code: func NewRand(seed string) *rand.Rand {
  	var seedInt int64
  	if seed != "" {
  		crcTable := crc64.MakeTable(crc64.ISO)
  		seedInt = int64(crc64.Checksum([]byte(seed), crcTable))
  	} else {
  		seedInt = time.Now().UnixNano()
  	}
  
  	randSource := rand.NewSource(seedInt)
  	return rand.New(randSource)
  }
docs: // NewRand returns a seeded random number generator, using a seed derived
  // from the provided string.
  //
  // If the seed string is empty, the current time is used as a seed.