code: public String getFormatedSequence(final int width) {
  	if (sequence == null) {
  		return "";
  	}
  
  	assert width >= 0 : "Wrong width parameter ";
  
  	final StringBuilder sb = new StringBuilder(sequence);
  	int nchunks = sequence.length() / width;
  	// add up inserted new line chars
  	nchunks = (nchunks + sequence.length()) / width;
  	int nlineCharcounter = 0;
  	for (int i = 1; i <= nchunks; i++) {
  		final int insPos = width * i + nlineCharcounter;
  		// to prevent inserting new line in the very end of a sequence then
  		// it would have failed.
  		// Also covers the case when the sequences shorter than width
  		if (sb.length() <= insPos) {
  		break;
  		}
  		sb.insert(insPos, "\n");
  		nlineCharcounter++;
  	}
  	return sb.toString();
  	}
docs: Format sequence per width letter in one string. Without spaces.
  
  @return multiple line formated sequence, one line width letters length