Task 2 plpgsql done

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diff --git a/challenge-215/luca-ferrari/postgresql/ch-2.sql b/challenge-215/luca-ferrari/postgresql/ch-2.sql
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+--
+-- Perl Weekly Challenge 215
+-- Task 2
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-215/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc215;
+
+CREATE OR REPLACE FUNCTION
+pwc215.task2_plpgsql( c int, digits int[] )
+RETURNS boolean
+AS $CODE$
+DECLARE
+	done boolean;
+	i    int;
+BEGIN
+	i := 2;
+	WHILE c > 0 LOOP
+	      done := false;
+
+	     WHILE i < array_length( digits, 1 )  LOOP
+	     	 IF digits[ i ] = 0 AND digits[ i - 1 ] = 0 AND  digits[ i + 1 ] = 0 THEN
+		    digits[ i ] := 1;
+		    done := true;
+		    c := c - 1;
+		    EXIT;
+		 END IF;
+
+		 i := i + 1;
+	     END LOOP;
+
+
+	     IF NOT done THEN
+	     	EXIT;
+	     END IF;
+	END LOOP;
+
+	IF c = 0 THEN
+	   RETURN true;
+	ELSE
+	   RETURN false;
+	END IF;
+END
+$CODE$
+LANGUAGE plpgsql;