This is a console-based Gobang (Five in a Row) game program.
It provides a 15x15 board, supports player vs AI gameplay with
different difficulty levels for the AI. The game implements an
AI decision-making system based on the minimax algorithm,
featuring core game logic such as board evaluation and win/loss
determination. The program offers a user-friendly command-line
interface for easy operation and game viewing, aiming to provide
players with an entertaining and challenging Gobang game experience.

- Two-player mode
- Standard 15x15 game board
- Alternating black and white stone placement
- Automatic win/loss determination