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;