working on new method. removed debug line

spec/note_spec.cr

@@ -29,4 +29,11 @@ describe Medley::Note do
     end
   end
 
+  describe ".halfstep_down" do
+    it "returns G when given G#" do
+      note = Medley::Note.new("G#")
+      note.halfstep_down.should eq "G"
+    end
+  end
+
 end

src/medley/note.cr

@@ -57,12 +57,25 @@ module Medley
       when .double_flat?
         @current_note[0..1].to_s
       when .double_sharp?
-        puts "double sharp #{@current_note}"
         aliased = ALIASES[@current_note]
         return "#{aliased}#"
       end
     end
 
+    def halfstep_down
+      case self
+      when .natural?, .flat?
+        return "#{@current_note}b"
+      when .sharp?
+        return @current_note[0].to_s
+      when .double_sharp?
+        @current_note[0..1].to_s
+      when .double_flat?
+        aliased = ALIASES[@current_note]
+        return "#{aliased}b"
+      end
+    end
+
     def wholestep_up
       new_note = Note.new(halfstep_up, @current_note)
       new_note.halfstep_up