fixes

[nahss]

Hey nullccxsy, lovely submission I went through your dapp and noticed a few issues and optimizations. Below are some of the changes I made:

Summary of Changes

Bug Fixes & Improvements:

• Improved Code Readability and Consistency: Enhanced the readability and consistency of the codebase.
• Ensured Proper Destruction of Vectors: Implemented proper destruction of vectors to avoid memory leaks.
• Added Assert Statements: Included assert statements to prevent misuse and ensure robust code execution.
• Optimized Logic: Optimized some of the logic in functions for better performance.

New Features:

• get_lottery_details: Added to fetch details of a specific lottery.
• list_all_lotteries: Added to list all existing lotteries.
• get_user_lottery_stubs: Added to fetch all lottery stubs owned by a user.
• extend_lottery: Added to extend the duration of an existing lottery.