Dear Monks,
I have a task which has as follows:

Make a subroutine that removes duplicates from a list. If the list is 
+passed as an array, then return a clean list. If the list is passed a
+s a reference to an array then clean the given array in place.
[download]

My problem is that I have these two sub-routines, one for each case:

sub clean_list {

    my @array_with_duplicates=(@_);
    my @array_no_duplicates;

    my $previous = '';
    while (scalar @array_with_duplicates > 0) 
    {
           my $next = shift(@array_with_duplicates);
           if ($previous ne $next) 
           {
             push(@array_no_duplicates, $next);
             $previous = $next;
           }
    }
[download]

that would work on a code like this (case 1):

open(IN, '<', 'myfile') or die "Could not read file\n";
my @array_with_duplicates = <IN>;
close IN;
@array_with_duplicates = sort @array_with_duplicates;

clean_list(@array_with_duplicates);

open(OUT, ">", "myfile.NO_DUPLICATES") or die "Could not create file\n
+";
print OUT @array_no_duplicates;
close OUT;
[download]

and

sub clean_array 
{
  my %hash;
  @hash{@{$_[0]}}=();
  @{$_[0]}=keys %hash;
}
[download]

that would work on a code like this (case 2):

open(IN, '<', 'myfile') or die "Could not read file\n";
my @initial_array = <IN>;
close IN;

clean_array(\@initial_array); 

open(OUT, ">", "myfile.NO_DUPLICATES") or die "Could not create file\n
+";
print OUT @initial_array;
close OUT;
[download]

Can you help me create 1 script that can handle both cases?

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