Task 1 plperl done

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diff --git a/challenge-219/luca-ferrari/postgresql/ch-1.plperl b/challenge-219/luca-ferrari/postgresql/ch-1.plperl
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+--
+-- Perl Weekly Challenge 219
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-219/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc219;
+
+CREATE OR REPLACE FUNCTION
+pwc219.task1_plperl( int[] )
+RETURNS SETOF int
+AS $CODE$
+   my ( $n ) = @_;
+   for my $value ( sort { $a <=> $b }  map { $_ * $_ } $n->@* ) {
+       return_next( $value );
+   }
+return;   
+$CODE$
+LANGUAGE plperl;