chore: rm unused methods

[wei3erHase]

subtract_balance method was used on transfer, enforcing INITIAL_TRANSFER_CALL_MAX_NOTES (= 2) amount of Notes to be processed, else to go into recursion. This method isn't needed in this use case, it was needed before on setup_refund flow, which is currently out of scope for Token.

cancel_authwit isn't being used once within the packages repo, and is theoretically wrong here, the auth witness is handled by the account contract, no nullifier happens at the token level, so emitting a nullifier for the auth witness here doesn't make sense

Update: we should maintain subtract_balance as they decided to use recursion on every transfer flow

Summary by CodeRabbit

• Refactor
  • Streamlined token transfers by simplifying the balance subtraction process.
  • Optimized operations by removing redundant checks and recursive steps, enhancing transaction efficiency and reliability.

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request introduces notable modifications to the token contract by simplifying the balance subtraction and transfer logic. The changes remove two global variables previously used to limit note processing during transfers as well as several methods associated with recursive balance subtraction. In the updated implementation, the transfer function now directly subtracts the balance by calling the subtraction method, and it directly emits a note for the sender address. Additionally, the private transfer and burn functions have been refactored to eliminate redundant nonce checks. Overall, these modifications streamline the token transfer process by removing the recursive handling of notes, resulting in a more straightforward approach to balance management while maintaining the core structure of the contract.

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between a41733c and f6a1711.

📒 Files selected for processing (1)

• src/token_contract/src/main.nr (2 hunks)

⏰ Context from checks skipped due to timeout of 300000ms (1)

• GitHub Check: setup-and-run

🔇 Additional comments (2)

src/token_contract/src/main.nr (2)

20-20: Addition of context::PrivateContext import is appropriate.

Including context::PrivateContext enables the use of PrivateContext within the contract, which is necessary for managing private context operations.

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183-192: Simplification of the transfer function enhances readability and efficiency.

By directly invoking sub and add methods on balances and using encode_and_encrypt_note_unconstrained, the code eliminates the complexity of recursive balance handling. This streamlines the transfer function and makes it more maintainable.

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[wei3erHase]

Closing as it was only experimental.