Pls help me with fix error in my checkers game

[ValeriiVysotskyi]

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Hello everyone who joined this discussion. I recently started programming in C++, so I don't understand many terms. I need to write a checkers project. I wrote the board display and moved on to writing the game logic and rules. I encountered a problem that I cannot combine the logic, board, and the main file that displays it all. The problem is that after the player makes a move (enters it in the console), I need to check their move for correctness. Accordingly, I should send the received data to the logic class, and also for checking, I need a board (an array with the current position of the checkers), which I also need to pass to the logic. And because of this, the program doesn't work. Who can please point out the mistake, I would be very grateful. And immediately sorry for the messy code)
checkers.zip

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