public static String diffStr(String s1, String s2) {
		// Create a string indicating differences
		int minLen = Math.min(s1.length(), s2.length());
		char diff[] = new char[minLen];
		for (int j = 0; j < minLen; j++) {
			if (s1.charAt(j) != s2.charAt(j)) {
				diff[j] = '|';
			} else diff[j] = ' ';

		}
		return new String(diff);
	}