It seems like you're writing your arrays as array references just so you can avoid creating a reference out of a non-reference.

You have:

    foreach $line (@lines){
        chomp $line;
        $count++;
        next unless $count; # skip header in csv 
        my $row;
        @$row = split(/,/, $line );
        push @$sheet2 , $row;
    }
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But if you ask me, it'd be tons more clear if you did this:

my @sheet2 = ()

# ....
    
    foreach $line (@lines){
        chomp $line;
        $count++;
        next unless $count; # skip header in csv 
        my @row = ();
        @row = split(/,/, $line );
        push @sheet2 , \@row;
    }
[download]

Another example is:

@$sheet2 = ();
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Should be:

@sheet2 = ();
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or

$sheet2 = [];
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It seems to me you're conflating scalars, arrays, and references. Cleaning up the code and being consistent will go a long way in dispelling your confusion.

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