How can I avoid the nil printed in the end?

Question

I have coded this function that prints-out the state of the board, but in the end, due to the fact that there isnt no return the function prints an nil!

Function:

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Answer 1

adding (values) as return form for dotimes will do it:

(dotimes (number 8 (values))
   .....)

after all, show-board indeed doesn't return any values, right?