Done

lib/dog.rb

@@ -0,0 +1,11 @@
+# define Dog class
+class Dog
+# define #bark that puts "Woof!"
+  def bark
+    puts "Woof!"
+  end
+# define #sit => puts "The Dog is sitting"
+  def sit
+    puts "The Dog is sitting"
+  end
+end

lib/person.rb

@@ -0,0 +1,11 @@
+# define Person class
+class Person
+# define #walk => puts "The Person is walking"
+  def walk
+    puts "The Person is walking"
+  end
+# define #talk => puts "Hello World!"
+  def talk
+    puts "Hello World!"
+  end
+end