bool is_valid_input(int y, int x, unsigned int pawn_array[board_size][board_size]);
bool is_box_type(int y, int x, unsigned int pawn_array[board_size][board_size], unsigned int type);
bool is_board_full(unsigned int pawn_array[board_size][board_size]);
bool is_valid_input(int y, int x, unsigned int pawn_array[board_size][board_size]);
bool is_box_type(int y, int x, unsigned int pawn_array[board_size][board_size], unsigned int type);
bool is_board_full(unsigned int pawn_array[board_size][board_size]);