anchor.diff:  (defun cartoon-dads (input)
       "you should be able to complete this case statement"
     (case input (:this-one-doesnt-happen :fancy-cat)
  -              (t :unknown)))
  +              (:bart :homer)
  +              (:stewie :peter)
  +              (:stan :randy)
  +              (t :unknown)
  +  )
  +)
   
   (define-test test-your-own-case-statement
       "fix this by completing the 'cartoon-dads' function above"
  
positive.code:         (cond ((> a 0) :positive)
                ((< a 0) :negative)
                (t :zero)))
    (assert-equal ____ c))
  
negative.code:          (lastname (case name ("John" "Doe")
                                ("Max" "Mustermann")
                                (t "Anonymous"))))
    (assert-equal "Anonymous" lastname)))
  
  (define-test test-cond
      "cond is the general purpose form for checking multiple
  