cargo run
- board: Board
- game_difficult: GameDifficult
- lost: bool
- open_field(pos: Position)
- create_board()
- populate_mines()
- new(width, height, mine_count)
- open_fields_pos
- mine_fields_pos
- flag_fields_pos
- get_neighbors() -> Vec
- count_neighboring_mines()
- is_open()
- is_mine()
- is_flag()
- The field can't be flagged
- if not mine:
- Count all the mines surrounding the field
- If count is 0, count all the mines surrounding the neighbors
- else
- Game is lost