print join " ", unpack("(H2)*", $s);

##</code><code>##

$ ./669879.pl
The string is: 'Resume'
        52 65 73 75 6d 65

        Uppercase: 'RESUME'
        Lowercase: 'resume'
        length = 6
        bytes = 6

The string is: 'Résumé'
        52 c3 a9 73 75 6d c3 a9

        Uppercase: 'RÉSUMÉ'
        Lowercase: 'résumé'
        length = 6
        bytes = 8