Fix spelling mistake in challenge/utility.py

[mohityadav8]

This commit fixes a spelling mistake in challenge/utility.py.

Change:

• avilable → available

This improves code readability and correct spelling in the project.

[caffeine-rohit]

Hey @mohityadav8 , thanks for your contribution.
Just a small suggestion, instead of opening multiple small PRs (like for minor spelling fixes), it’s better to combine them into a single PR. It keeps things cleaner and more meaningful.

Looking forward to your great contributions ahead!!

[mohityadav8]

caffeine-rohit
Thanks for the suggestion. I just want to clarify my approach here. I am intentionally fixing issues file by file to keep each change focused and easy to review. From my perspective, combining multiple unrelated fixes into a single PR can sometimes introduce unnecessary noise in the review process.
For now, I prefer keeping PRs small and specific. If the maintainers prefer that these fixes be combined into a single PR, I’m completely open to changing my approach and will gladly update it accordingly.
Until such guidance is given by the maintainers @RupakBiswas-2304 , I believe keeping them separate is a reasonable approach.