sub bbl_sort {
    my $array = shift;
    my $not_complete = 1;
    my $index;
    my $len = ((scalar @$array) - 2);
    while ($not_complete) {
        $not_complete = 0;
        foreach $index (0 .. $len) {
            if (@$array[$index] > @$array[$index + 1]) {
                my $temp = @$array[$index + 1];
                @$array[$index + 1] = @$array[$index];
                @$array[$index] = $temp;
                $not_complete = 1;
            }
        }
    }
}