Game crashes with index out of range error for invalid row/column input in Dots & Boxes AI game

[yuvraj-k-singh]

📝 Description

The Dots & Boxes AI game does not properly validate user-entered row and column values before accessing board arrays.

Currently, the game directly accesses horizontal_lines[row][col] and vertical_lines[row][col] using user input. If the player enters negative values or values outside the valid board range, the program may crash or behave unexpectedly.

Additionally, the code uses a broad except: block, which hides the actual error and makes debugging difficult.

🔗 Linked Issue

Closes #629

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📋 Contribution Checklist

• My code strictly adheres to the project guidelines (Standard library only, procedural code, clean spacing).
• I have verified that my files are placed in the correct directory.
• I have tested my changes thoroughly on my local machine.
• I have included interactive emojis and clean console/UI outputs.
• GSSoC 2026: I have been formally assigned to this issue and noted it above.

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