jodd-core/src/main/java/jodd/util/NaturalOrderComparator.java
private static char charAt(final String string, final int ndx) {
		if (ndx >= string.length()) {
			return 0;
		}
		return string.charAt(ndx);
	}
private static char charAt(final String string, final int ndx) {
		if (ndx >= string.length()) {
			return 0;
		}
		return string.charAt(ndx);
	}
private static char charAt ( final String string , final int ndx ) { if ( ndx >= string . length ( ) ) { return 0 ; } return string . charAt ( ndx ) ; }
Safe {@code charAt} that returns 0 when ndx is out of boundaries.
Safe {