Improve move_zeros algorithm (readability and efficiency)

[idowujames]

This update improves the move_zeros algorithm by:

• Using isinstance(i, bool) for cleaner boolean type checking
• Avoiding temporary list allocation when appending zeros
• Clearer inline comments of the if-statement
• Removed the print statement and function call at the end of the code file

[keon]

Thanks for the suggestion! The change is relatively minor and doesn't significantly improve the algorithm. Closing for now.