Optimize max area function

[glasss13]

Questions

Please include the following when you are writing your PR:
General things:

1. What is the purpose of this PR?
   Optimize max area function
2. What changes did you make? Why?
   I optimized the max area function so that it runs within the alotted time
3. What bugs did you find while testing?
   None.

This PR Specific:

1. What was the bug you found?
   The initial function was running in O(n^2) which is inefficient
2. How did you address it?
   Changed the algorithm to use a two pointer approach to run in O(n)
3. What did you struggle with?
   Nothing
4. Is there anything you would change about this step?
   No
5. What was the code given to you by the tests?
   Slow

[minnce]

nice! lgtm