refactor: Enhanced error handling and optimized logic.

[Ultimecia1463]

Summary of Changes:

• Improved fallback handling for missing description, topics, and statistics to prevent undefined values.
• Added comments for clarity and readability.
• Optimized countLanguageUsage logic using the nullish coalescing operator (??)
• Separate fetch Logic: Each method keeps its own fetch implementation, as per your request.
• Enhanced error messages with more context, including the specific repository and error details.

These changes improve code readability, robustness, and maintain consistency across the files.

[Ultimecia1463]

@2M4U

[shubhamos-ai]

Thanks for documenting this clearly! I have experience with this type of implementation and would be happy to assist with the development.