code: func TransactionsToTrytes(txs Transactions) ([]Trytes, error) {
  	trytes := make([]Trytes, len(txs))
  	var err error
  	for i := range txs {
  		trytes[i], err = TransactionToTrytes(&txs[i])
  		if err != nil {
  			return nil, err
  		}
  	}
  	return trytes, nil
  }
docs: // TransactionsToTrytes returns a slice of transaction trytes from the given transactions.