fix contract
original commit: 0e3ede92a01981cfe878665aaa62cee0ae8bb6b1
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@ -13,8 +13,8 @@ up an image.
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@defproc[(render-image [image image?]
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[dc (is-a?/c dc<%>)]
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[dx number?]
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[dy number?])
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[dx real?]
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[dy real?])
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void?]{
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Draws @racket[image] in @racket[dc] at the position (@racket[dx],@racket[dy]).
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}
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