2 files changed, 59 insertions, 0 deletions
diff --git a/challenge-057/mohammad-anwar/raku/ch-2.p6 b/challenge-057/mohammad-anwar/raku/ch-2.p6
new file mode 100644
index 0000000000..96d5405f76
--- /dev/null
+++ b/challenge-057/mohammad-anwar/raku/ch-2.p6
@@ -0,0 +1,27 @@
+#!/usr/bin/env perl6
+
+use v6.d;
+
+sub shortest-unique-prefix($words where .all ~~ Str) {
+    my $p = [];
+    for |$words -> $word {
+        my $i = 1;
+        my $l = $word.chars;
+        while $i < $l {
+            my $char  = $word.substr(0, $i);
+            my $count = $words.grep({ m/^$char/ }).elems;
+
+            $count > 1 && $i++ and next;
+            $p.push: $char and last;
+        }
+    }
+
+    return $p;
+}
+
+unit sub MAIN();
+
+my $words  = [ "alphabet", "book", "carpet", "cadmium", "cadeau", "alpine" ];
+my $unique = shortest-unique-prefix($words);
+
+say sprintf("[ %s ]", $unique.join(", "));
diff --git a/challenge-057/mohammad-anwar/raku/ch-2a.p6 b/challenge-057/mohammad-anwar/raku/ch-2a.p6
new file mode 100644
index 0000000000..8d39ce40b7
--- /dev/null
+++ b/challenge-057/mohammad-anwar/raku/ch-2a.p6
@@ -0,0 +1,32 @@
+#!/usr/bin/env perl6
+
+use Test;
+
+my $unit-tests = [
+    { in => [ "alphabet", "book", "carpet", "cadmium", "cadeau", "alpine" ],
+     out => [ "alph", "b", "car", "cadm", "cade", "alpi" ]
+    }
+];
+
+for $unit-tests -> (:@in, :@out) {
+    is-deeply(shortest-unique-prefix(@in), @out);
+}
+
+done-testing;
+
+sub shortest-unique-prefix($words where .all ~~ Str) {
+    my $p = [];
+    for |$words -> $word {
+        my $i = 1;
+        my $l = $word.chars;
+        while $i < $l {
+            my $char  = $word.substr(0, $i);
+            my $count = $words.grep({ m/^$char/ }).elems;
+
+            $count > 1 && $i++ and next;
+            $p.push: $char and last;
+        }
+    }
+
+    return $p;
+}