use utf8;
use Text::Unaccent;
use Encode::Detect::Detector;

## my $author = "Sch%F6ttl";
my $author = "Sch%F6%F6ttl";

$author =~ s/%([a-zA-Z0-9][a-zA-Z0-9])/pack('C',hex($1))/eg;
my $encoding = Encode::Detect::Detector::detect($author);
print "encoding: $encoding: $author <br>\n";
if($encoding){
  $author = unac_string($encoding, $author);
  print "after unac: $author<br>\n";
}