public static String join(String separator, List<String> strings) {
		StringBuilder appendable = new StringBuilder();
		if (strings != null && strings.size() > 0) {
			appendable.append(strings.get(0));
			for (int i = 1; i < strings.size(); i++) {
				appendable.append(separator).append(strings.get(i));
			}
		}
		return appendable.toString();
	}