code: func (k *Kerl) AbsorbTrytes(inn Trytes) error {
  	var in Trits
  	var err error
  
  	if len(inn) == 0 {
  		in = Trits{0}
  	} else {
  		in, err = TrytesToTrits(inn)
  		if err != nil {
  			return err
  		}
  	}
  	return k.Absorb(in)
  }
docs: // AbsorbTrytes fills the internal State of the sponge with the given trytes.