See join for joining array elements into a string.

See map for converting array elements into other.

Basically, your conversion will look like this:

my @array = qw(balack white green red);

my @tagged_array = map { ... } @array;
my $result = join ... @tagged_array;

print $result;
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Of course, I've left out the interesting parts, but as you don't show the code you've written, I can't help you more.