CLÉ USB
CLÉMMY USB

##</code><code>##

CL? USB
CL?MMY USB

##</code><code>##

use strict;
use warnings;
use feature qw( :5.10 );
use Data::Dumper;$Data::Dumper::Indent=1;
use Carp;
use Encode qw( from_to );
use POSIX qw( setlocale LC_CTYPE );

setlocale(LC_CTYPE, "fr_CA.ISO8859-1");

my $file = q{./yard};
open my $IN, '<', $file or croak;
while (my $l = <$IN>) {
  chomp $l;
  say "1: $l";
  my $m = $l;
  from_to($m, "iso-8859-1", "utf8");
  say "2: $m";
  say "3: ", xlc($m);
}
close $IN or croak;

sub xlc {
    my $str = shift;
    return join q{} => ( map { ucfirst(lc($_)) } ( $str =~ m/(\W+|\w+)/g ) );
};

##</code><code>##

1: CL? USB
2: CLÉ USB
3: ClÉ Usb
1: CL?MMY USB
2: CLÉMMY USB
3: ClÉMmy Usb