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Useless parts of code

Useless parts of code

(OP)
I have to implement a program which finds useless parts of code and replace its with some better code. I'll give you an example:
;;(define (positive-odd? n)
;;  (if (and (odd? n) (positive? n)) #t #f))

should be replaced with:

;;(define (positive-odd? n)
;;  (and (odd? n) (positive? n)))

I also have a list with rules. I'll give you an example of rule which will help us for the the example for bellow:

;;(define redundant-if
;;  '((WHEN (if ?cond #t #f))
;;    (THEN ?cond)))

So, I have to iterate on this list of rules and find matching between rules and my function with useless code. To do that i have only an idea, but i don't think it's a good one: I take very rule from the list of rules, then I iterate on the body of my function and look up for similarities and when I find one, I replace the code. But I think it's quite difficult to do this.
Please give me any idea of this problem's implementation.
Thank you!  

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