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:          (lastname (case name ("John" "Doe")
                                ("Max" "Mustermann")
                                (t "Anonymous"))))
    (assert-equal ____ lastname)))
  
  (define-test test-cond
      "cond is the general purpose form for checking multiple
  
negative.code:   (assert-equal a 100))
  
  
    (define-test write-your-own-let-statement
        "fix the let statement to get the tests to pass"
      (setf a 100)
      (setf b 23)
      (setf c 456)
      (let ((a 100)
            (b 200)
            (c "Jellyfish"))
        (assert-equal a 100)
        (assert-equal b 200)
        (assert-equal c "Jellyfish"))
      (let* ((a 121))
        (assert-equal a 121)
        (assert-equal b 23)
        (assert-equal c c )))
  
  (define-test test-case
      "the case form is like the C switch statement: it
  