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Exercise 7.29

Before querying the database, the test file will make sure your new matches? predicate works correctly by running these tests: 
(assert (equal? (matches?-for-7.29 '(_ b _) 
                                   '(a b c)) 
                #t))

(assert (equal? (matches?-for-7.29 '(_ x _) 
                                   '(a b c)) 
                #f))

(assert (equal? (matches?-for-7.29 '(a (b c) d) 
                                   '(a c d)) 
                #t))

(assert (equal? (matches?-for-7.29 '(a (b c) d) 
                                   '(a e d)) 
                #f))

(assert (equal? (matches?-for-7.29 '(a _ ...) 
                                   '(a b c d e)) 
                #t))
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