Wk 149 Task 2

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diff --git a/challenge-149/cheok-yin-fung/blog.txt b/challenge-149/cheok-yin-fung/blog.txt
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+++ b/challenge-149/cheok-yin-fung/blog.txt
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+https://E7-87-83.github.io/coding/challenge_149.html
diff --git a/challenge-149/cheok-yin-fung/perl/ch-2.pl b/challenge-149/cheok-yin-fung/perl/ch-2.pl
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+++ b/challenge-149/cheok-yin-fung/perl/ch-2.pl
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+# The Weekly Challenge 149
+# Task 2 Largest Square
+
+use v5.22.0;
+use warnings;
+use Math::BigInt;
+use List::Util qw/uniq/;
+use Test::More tests => 5;
+
+my $_N = $ARGV[0] || 3;
+
+find_sq($_N);
+
+sub find_sq {
+
+    my $N = $_[0];
+
+    my $upper_sqrt = Math::BigInt->new($N)->bpow( int(($N+1)/2));
+    my $sq = Math::BigInt->new($upper_sqrt)->bpow(2);
+
+    my $bool = undef;
+
+    do {
+        $upper_sqrt->bdec();
+        $sq->bsub($upper_sqrt)->bsub($upper_sqrt)->bdec();
+        my $sq_baseN = $sq->to_base($N);
+        my @arr = split "", $sq_baseN;
+        my $uniq_num = uniq @arr;
+        $bool = 1 if scalar @arr == $uniq_num;
+    } while (!$bool);
+
+    say "in decimal base: ", $sq;
+    say "in base-N: ", $sq->to_base($N);
+
+    return $sq;
+}
+
+ok find_sq(2) == 1, "N = 2";
+ok find_sq(3) == 1, "N = 3";
+ok find_sq(7) == 751689, "N = 7";
+ok find_sq(8) == 10323369, "N = 8";
+ok find_sq(12) == 8706730814089, "N = 12";