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Feb 17th, 2021
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  1. #lang racket
  2.  
  3. (struct robot (x y energy item))
  4.  
  5. (define (displace-robot rob dx dy)
  6.   (struct-copy robot rob [x (+ (robot-x rob) dx)]
  7.                          [y (+ (robot-y rob) dy)]))
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