Sure, here are some more specific tips on how to write the functions to initialize the game board, draw the game board, get the player's move, make a move, and check for a winner in a Tic Tac Toe game in C:

**Initialize the game board:**

The `initialize_game_board()` function should simply fill the game board with dashes ('-'). You can do this with a nested for loop:

```c
void initialize_game_board(char board[BOARD_SIZE][BOARD_SIZE]) {
  for (int i = 0; i < BOARD_SIZE; i++) {
    for (int j = 0; j < BOARD_SIZE; j++) {
      board[i][j] = '-';
    }
  }
}
```

**Draw the game board:**

The `draw_game_board()` function should print the game board to the console. You can do this with another nested for loop:

```c
void draw_game_board(char board[BOARD_SIZE][BOARD_SIZE]) {
  printf("\n");
  for (int i = 0; i < BOARD_SIZE; i++) {
    for (int j = 0; j < BOARD_SIZE; j++) {
      printf("| %c ", board[i][j]);
    }
    printf("|\n");
  }
  printf("\n");
}
```

**Get the player's move:**

The `get_player_move()` function should prompt the player for their move and return the row and column of their choice. You can do this with the `scanf()` function:

```c
int get_player_move(char board[BOARD_SIZE][BOARD_SIZE], int player) {
  int row, column;
  printf("Player %c, enter your move: ", player);
  scanf("%d %d", &row, &column);

  // Validate the move.
  if (row < 0 || row >= BOARD_SIZE || column < 0 || column >= BOARD_SIZE || board[row][column] != '-') {
    printf("Invalid move. Please try again.\n");
    return get_player_move(board, player);
  }

  return row * BOARD_SIZE + column;
}
```

**Make a move:**

The `make_move()` function should update the game board with the player's move. You can do this by simply setting the corresponding element of the game board array to the player's symbol:

```c
void make_move(char board[BOARD_SIZE][BOARD_SIZE], int row, int column, int player) {
  board[row][column] = player;
}
```

**Check for a winner:**

The `check_winner()` function should check if the current player has won the game by having three of their symbols in a row, column, or diagonal. You can do this by checking all possible winning combinations:

```c
int check_winner(char board[BOARD_SIZE][BOARD_SIZE]) {
  // Check the rows.
  for (int i = 0; i < BOARD_SIZE; i++) {
    if (board[i][0] == board[i][1] && board[i][1] == board[i][2] && board[i][0] != '-') {
      return board[i][0];
    }
  }

  // Check the columns.
  for (int i = 0; i < BOARD_SIZE; i++) {
    if (board[0][i] == board[1][i] && board[1][i] == board[2][i] && board[0][i] != '-') {
      return board[0][i];
    }
  }

  // Check the diagonals.
  if (board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[0][0] != '-') {
    return board[0][0];
  }

  if (board[0][2] == board[1][1] && board[1][1] == board[2][0] && board[0][2] != '-') {
    return board[0][2];
  }

  // No winner yet.
  return -1;
}
```

You can use these functions as a starting point to write your own Tic Tac Toe game in C.
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