docs: private static String addLineNumber(String code) {
  		String[] lines = code.split("\n");
  		StringBuilder builder = new StringBuilder();
  		for (int i = 0; i < lines.length; i++) {
  			builder.append("/* ").append(i + 1).append(" */").append(lines[i]).append("\n");
  		}
  		return builder.toString();
  	}