question: public static String unescape ( String in ) { StringBuilder out = new StringBuilder ( ) ; char last = 0 ; for ( char c : in . toCharArray ( ) ) { if ( c == ESC ) { if ( last != 0 && last == ESC ) out . append ( c ) ; } else out . append ( c ) ; last = c ; } return out . toString ( ) ; }
target:  Unescaped a \ escaped string.