fix: ignore case and spaces in Palindrome Checker

[Anamikaasinghraj]

Updated palindrome_checker.py to ignore uppercase/lowercase and spaces.
Now "Race Car" will correctly return True.

[ShravanDalavi]

Updated palindrome_checker.py to ignore uppercase/lowercase and spaces. Now "Race Car" will correctly return True.

Great improvement! 👍 Thanks for making it more robust.
Just a couple of small fixes before I can merge:

1. Replace word with s in the else block.
2. Remove the extra palindrome_checker() call at the bottom (since main() handles execution).

Once you update those, I’ll be happy to merge 🚀