[racket] 27.1.3

I am having trouble changing the Sierpinski function to consume structures, instead of coordinates. I used the same function design for too-small as in 27.1.1, I edited each sub function used to consume triangles as well. When testing the new function with a triangle, and comparing it to previous functions the answer is the same.
(ie (=(somefunction  a b c)(somefunction triangle)). My assumption in the final step of the Sierpinski function was to have the recursive call applied to a newly made triangle with the correct midpoints as the posns, I used (make-triangle p1 mp mp). I'm not quite sure what I have done wrong here. Thanks in advance for any help.



      
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