updates pets exercise

modules/pets/lib/cat.rb

@@ -3,20 +3,18 @@ class Cat
 
   def initialize(name)
     @name = name
-    @sound = "Meow"
-    @toy = "string"
   end
 
   def cute?
     true
   end
 
   def speak
-    "#{@sound}, my name is #{@name}"
+    "Meow, my name is #{@name}"
   end
 
   def play
-    "Playing with #{@toy}"
+    "Playing with string"
   end
 
 end

modules/pets/lib/dog.rb

@@ -4,20 +4,18 @@ class Dog
   def initialize(name)
     @name = name
     @tricks = []
-    @sound = "Woof"
-    @toy = "ball"
   end
 
   def cute?
     true
   end
 
   def speak
-    "#{@sound}, my name is #{@name}"
+    "Woof, my name is #{@name}"
   end
 
   def play
-    "Playing with #{@toy}"
+    "Playing with ball"
   end
 
   def learn_trick(trick)