fixes and cleanup

[FarzeenKist]

Fixes and Improvements

1. Cleanup of redundant variables that were not used/already provided by another variable (the creator address in the Global object/class)
2. I've noticed that users could like and dislikes as many times as they wished. I've gone ahead and fixed that by having a local variable like keep track of whether the sender has liked it. I didn't add a check in the like and dislike subroutine/function to check if the user has opted in since it's already required by the blockchain to be able to use local storage, however, feel to add one if you see the need for it.
3. Implemented the function to run when a user opts in.
4. Added additional comments to clarify of what the checks are doing
5. Removed redundant checks in your functions around the group transactions as it was unnecessary, instead I'd suggest you make the transactions to be individual on the frontend instead of being grouped(except the buy function)

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Name	Status	Preview	Updated
booksville	✅ Ready (Inspect)	Visit Preview	Oct 21, 2022 at 5:55PM (UTC)

[LMDH01]

nice