Generic operations in rational-arithmetic package

Modify the rational-arithmetic package to use generic operations, but change make-rat so that it does not attempt to reduce fractions to lowest terms. Test your system by calling make-rational on two polynomials to produce a rational function

(define p1 (make-polynomial 'x '((2 1)(0 1))))

(define p2 (make-polynomial 'x '((3 1)(0 1))))

(define rf (make-rational p2 p1))

Now add rf to itself, using add. You will observe that this addition procedure does not reduce fractions to lowest terms.

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