Enforce PEP8 naming conventions in Number Guessing App

[bhandareasmita]

Description:
Summary:
The codebase in the project- Number Guessing App exhibits inconsistent naming conventions, deviating from PEP 8 guidelines. This issue aims to enforce PEP 8 naming conventions within this specific file for improved readability and maintainability.

Proposed Changes:
Change variable names to follow snake_case.
Ensure global variables are in uppercase with underscores.
Update function and method names to adhere to PEP 8.

Expected Outcome:
The codebase should consistently follow PEP 8 naming conventions for improved readability and maintainability