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struct node {
    int data;
...
    }
    return start;
}

package doublyLinkedList;

...
    }
    return;
}

void pop(start)
    struct node *start;
...
    free(temp);
    return; # or maybe we can return the element popped before freeing
+ temp or whatever.
}

sub pop {
    my $self = shift;
...
    $self->{start}{prev} = $ret->{next} = undef;
    return $ret->{element};
}