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Simulate a turn-based Connect Four game on a fixed 6x7 grid where discs drop to the lowest available slot.
Detect wins by verifying four consecutive discs of the active player in horizontal, vertical, or diagonal directions.
Manage game states (PENDING, DRAW, WINNER) and format the board for visual output.
What This Tests
2D array manipulation and boundary validation
Directional scanning and neighbor counting
Turn-based state management and early termination
String construction and formatting
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