/in/board.c:2:16: error: unknown type name 'Board'
 void initBoard(Board board){
                ^~~~~
/in/board.c:13:2: error: unknown type name 'bool'; did you mean '_Bool'?
  bool isBlank(Disk disk){
  ^~~~
  _Bool
/in/board.c:13:15: error: unknown type name 'Disk'
  bool isBlank(Disk disk){
               ^~~~
/in/board.c:17:2: error: unknown type name 'bool'; did you mean '_Bool'?
  bool isinBoard(int x, int y){
  ^~~~
  _Bool
/in/board.c: In function 'isinBoard':
/in/board.c:18:11: error: 'o' undeclared (first use in this function)
   return (o<=x && x< BOARD_SIZE && o<=y && y< BOARD_SIZE);
           ^
/in/board.c:18:11: note: each undeclared identifier is reported only once for each function it appears in
/in/board.c:18:22: error: 'BOARD_SIZE' undeclared (first use in this function); did you mean '__WORDSIZE'?
   return (o<=x && x< BOARD_SIZE && o<=y && y< BOARD_SIZE);
                      ^~~~~~~~~~
                      __WORDSIZE
/in/board.c: At top level:
/in/board.c:24:2: error: unknown type name 'bool'; did you mean '_Bool'?
  bool isoppo(Disk disk1,Disk disk2){
  ^~~~
  _Bool
/in/board.c:24:14: error: unknown type name 'Disk'
  bool isoppo(Disk disk1,Disk disk2){
              ^~~~
/in/board.c:24:25: error: unknown type name 'Disk'
  bool isoppo(Disk disk1,Disk disk2){
                         ^~~~
/in/board.c:28:17: error: unknown type name 'Board'
  int countBoard(Board board,Disk disk){
                 ^~~~~
/in/board.c:28:29: error: unknown type name 'Disk'
  int countBoard(Board board,Disk disk){
                             ^~~~
/in/board.c:42:18: error: unknown type name 'Board'
  void printBoard(Board board){
                  ^~~~~