docs: private StringGrabber replaceCaseTo(int startPos, int endPos, ECase toCase) {
  
  		StringBuilder sbRange = new StringBuilder();
  
  		try {
  			for (int i = startPos; i < endPos; i++) {
  				sbRange.append(String.valueOf(sb.charAt(i)));
  			}
  		} catch (Exception e) {
  			e.printStackTrace();
  		}
  
  		final String caseConvertedRangeStr;
  
  		if (ECase.LOWER == toCase) {
  			caseConvertedRangeStr = sbRange.toString().toLowerCase();
  		} else {
  			caseConvertedRangeStr = sbRange.toString().toUpperCase();
  		}
  		try {
  			sb.replace(startPos, endPos, caseConvertedRangeStr);
  		} catch (Exception e) {
  			e.printStackTrace();
  		}
  		return StringGrabber.this;
  	}