1 files changed, 36 insertions, 0 deletions
diff --git a/challenge-063/arne-sommer/raku/rostr b/challenge-063/arne-sommer/raku/rostr
new file mode 100755
index 0000000000..1e81450e5e
--- /dev/null
+++ b/challenge-063/arne-sommer/raku/rostr
@@ -0,0 +1,36 @@
+#! /usr/bin/env raku
+
+subset XY where /^<[xy]>+$/;
+
+sub MAIN (XY $string = 'xyxx', :$verbose)
+{
+  my $length  = $string.chars;
+  my $current = $string;
+
+  my $count = 0;
+
+  loop
+  {
+    $count++;
+
+    my $rotate = $count % $length;
+
+    if $rotate
+    {
+      my $a = $current.substr($rotate);
+      my $b = $current.substr(0, $rotate);
+
+      $current = $a ~ $b;
+    
+      say ": Rotation $count: $current (moved '$b' to the end)" if $verbose;
+    }
+    elsif $verbose
+    {
+      say ": Rotation $count: $current (moved nothing)";
+    }
+
+    last if $current eq $string;
+  }
+
+  say "$count Rotations";
+}