You may assume that the board passed in is valid in the context of a game of Tic-Tac-Toe.

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They're technically the same version, so it should return true.

Added.

I think this should easily fixed validating that al characteers are numbers

Maybe yes ; maybe no ; but the outcome should only contain unique elements

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looks good

Should be fixed. Please check I didn't make any mistakes.

Still not resolved

Fixed. To fix a typo is more of a suggestion than an issue :P

Fixed.

That's not a legit input, so you don't need to solve for it. Tic-tac-toe can't have a row (or in your case column) of 3 Xs and 3 Os since players alternate adding values. So you'd never get your board state.

Currently having an issue with submitting this kata in golang the test tel me its nil but its not nil

Already reported 1 year ago, and still open.