Fix #40: Prevent ghost overlap using future position prediction

[ksaini-web]

Fix #40 - Ghost Overlap Issue

Changes Made

• Added future-position prediction for ghosts.
• Added ghost-to-ghost collision detection before movement.
• Prevented ghosts from moving into occupied future positions.
• Added direction redirection when overlap is detected.
• Optimized collision checks using direct coordinate comparison.

Testing

• Tested ghost movement behavior.
• Tested wall collision behavior.
• Tested Pac-Man collision behavior.
• Verified reduced ghost overlap during gameplay.