Clean up some code to eliminate unnecessary IO types.
Clean up some code to eliminate unnecessary IO types.

Was hoping this might help with #681, but alas, no change.

google/codeworld,alphalambda/codeworld,google/codeworld,pranjaltale16/codeworld,alphalambda/codeworld,alphalambda/codeworld,google/codeworld,pranjaltale16/codeworld,pranjaltale16/codeworld