challenge 253, raku solutions

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diff --git a/challenge-253/feng-chang/raku/ch-1.raku b/challenge-253/feng-chang/raku/ch-1.raku
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+++ b/challenge-253/feng-chang/raku/ch-1.raku
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+#!/bin/env raku
+
+unit sub MAIN($sep, *@strings);
+
+put @strings».split($sep, :skip-empty).flat.grep(?*).join(' ');
diff --git a/challenge-253/feng-chang/raku/ch-2.raku b/challenge-253/feng-chang/raku/ch-2.raku
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+++ b/challenge-253/feng-chang/raku/ch-2.raku
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+#!/bin/env raku
+
+unit sub MAIN(Str:D $s);
+
+use MONKEY-SEE-NO-EVAL;
+my @matrix;
+EVAL "@matrix = $s";
+
+put @matrix.pairs.sort({ .value.sum, +.key })».key.join(', ');
diff --git a/challenge-253/feng-chang/raku/test.raku b/challenge-253/feng-chang/raku/test.raku
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+++ b/challenge-253/feng-chang/raku/test.raku
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+#!/bin/env raku
+
+# The Weekly Challenge 253
+use Test;
+
+sub pwc-test(Str:D $script, Bool :$deeply? = False, *@input) {
+    my ($expect, $assertion) = @input.splice(*-2, 2);
+    my $p = run $script, |@input, :out;
+    if $deeply {
+        is-deeply $p.out.slurp(:close).chomp.words.Bag, $expect, $assertion;
+    } else {
+        is $p.out.slurp(:close).chomp, $expect, $assertion;
+    }
+}
+
+# Task 1, Split Strings
+pwc-test './ch-1.raku',
+    |<. one.two.three four.five six>,
+    'one two three four five six',
+    'Split Strings: @words = ("one.two.three", "four.five", "six"), $separator = "." => "one","two","three","four","five","six"';
+pwc-test './ch-1.raku',
+    |<$ $perl$$ $$raku$>,
+    'perl raku',
+    'Split Strings: @words = ("$perl$$", "$$raku$"),                $separator = "$" => "perl","raku"';
+
+# Task 2, Weakest Row
+pwc-test './ch-2.raku',
+    '[1,1,0,0,0],[1,1,1,1,0],[1,0,0,0,0],[1,1,0,0,0],[1,1,1,1,1]',
+    '2, 0, 3, 1, 4',
+    'Weakest Row: [[1,1,0,0,0],[1,1,1,1,0],[1,0,0,0,0],[1,1,0,0,0],[1,1,1,1,1]] => (2, 0, 3, 1, 4)';
+pwc-test './ch-2.raku',
+    '[1,0,0,0],[1,1,1,1],[1,0,0,0],[1,0,0,0]',
+    '0, 2, 3, 1',
+    'Weakest Row: [[1,0,0,0],[1,1,1,1],[1,0,0,0],[1,0,0,0]]                     => (0, 2, 3, 1)';
+
+done-testing;