my $tnt = [
           "http://www."    ,
           "https://www."   ,
          };

my $implode_url = sub {
    my ($url) = @_;
    my $len = scalar(@$tnt);
    for( my $i = 0 ; $i < $len; $i++) {
        $url =~ s/$tnt->[$i]/chr($i+1)/eg;  # +1 to avoid \0
    }
    return $url;
};