Game of Fifteen move() Function

bool move(int tile)
{
    int empty_tile = 0;
    for (int i = 0; i < d; i++)
    {
        for (int j = 0; j < d; j++)
        {
            // if the current element is a tile the user wants to move and the one above it is an empty space
            if (board[i][j] == tile && board[i + 1][j] == empty_tile)
            {
                swap(&board[i][j], &board[i + 1][j]);
                return true;
            }
            // else, if the one below the tile the user wants to move is an empty space
            else if (board[i][j] == tile && board[i - 1][j] == empty_tile)
            {
                swap(&board[i][j], &board[i - 1][j]);
                return true;
            }
            // else, if the one to the left of the tile the user wants to move is an empty space
            else if (board[i][j] == tile && board[i][j - 1] == empty_tile)
            {
                swap(&board[i][j], &board[i][j - 1]);
                return true;
            }
            // else, if the one to the right of the tile the user wants to move is an empty space
            else if (board[i][j] == tile && board[i][j + 1] == empty_tile)
            {
                swap(&board[i][j], &board[i][j + 1]);
                return true;
            }
            // else, if the one above the tile the user wants to move is not an empty space and if the
            // the said move is going over an edge of the board
            else if (board[i][j] == tile && board[i + 1][j] == board[d][d] && board[i + 1][j] != empty_tile)
            {
                return false;
            }
            // else, if the one below the tile the user wants to move is not an empty space and if the
            // the said move is going over an edge of the board
            else if (board[i][j] == tile && board[i - 1][j] == board[d][d] && board[i - 1][j] != empty_tile)
            {
                return false;
            }
            // else, if the one to the left of the tile the user wants to move is not an empty space and if the
            // the said move is going over an edge of the board
            else if (board[i][j] == tile && board[i][j - 1] == board[d][d] && board[i][j - 1] != empty_tile)
            {
                return false;
            }
            // else, if the one to the right of the tile the user wants to move is not an empty space and if the
            // the said move is going over an edge of the board
            else if (board[i][j] == tile && board[i][j + 1] == board[d][d] && board[i][j + 1] != empty_tile)
            {
                return false;
            }
        }
    }
    return false;
}

void swap(int *a, int *b)
{
    int *temp = a;
    *a = *b;
    *b = *temp;
}