sub encoding {
    my ( $string ) = @_;
    my @characters = ( 'A' .. 'Z', 'a' .. 'z', 0 .. 9, '-', '.' );
    my $max = max( $string =~ /\d+/g );
    $string =~ s{ ( \d+ ) }{$characters[ ( $1 / $max * 4095 ) / 64 ]$characters[ ( $1 / $max * 4095 ) % 64 ]}xg;
    $string =~ tr/,//d;
    $string =~ tr/|/,/;
    return $string;
    }