// WRONG
const NOT_AUTHORIZED: u64 = 0;
const INSUFFICIENT_BALANCE: u64 = 1;

// CORRECT — with #[error] for readable abort messages
#[error]
const ENotAuthorized: vector<u8> = b"Caller is not authorized to perform this action";
#[error]
const EInsufficientBalance: vector<u8> = b"Insufficient balance for this operation";

// Also valid — u64 without #[error] (less informative on abort)
const ENotAuthorized: u64 = 0;
const EInsufficientBalance: u64 = 1;

// WRONG
const MyConstant: vector<u8> = b"hello";
const feeNumerator: u64 = 3;

// CORRECT
const MY_CONSTANT: vector<u8> = b"hello";
const FEE_NUMERATOR: u64 = 3;

// WRONG
public struct Admin has key, store { id: UID }
public struct MintAuthority has key, store { id: UID }

// CORRECT
public struct AdminCap has key, store { id: UID }
public struct MintCap has key, store { id: UID }

// WRONG
public struct RegisterUser has copy, drop { user: address }
public struct CreatePool has copy, drop { pool_id: ID }
public struct LevelUp has copy, drop { new_level: u64 }

// CORRECT
public struct UserRegistered has copy, drop { user: address }
public struct PoolCreated has copy, drop { pool_id: ID }
public struct LeveledUp has copy, drop { new_level: u64 }

// WRONG
public fun get_name(u: &User): String { u.name }
public fun get_balance(u: &User): u64 { u.balance }

// CORRECT
public fun name(u: &User): String { u.name }
public fun balance(u: &User): u64 { u.balance }
public fun details_mut(u: &mut User): &mut Details { &mut u.details }

// WRONG
public struct FlashLoanPotato {}
public struct PromisePotato {}

// CORRECT
public struct FlashLoanReceipt {}
public struct Promise {}

// WRONG
public struct DynamicField has copy, drop, store {}
public struct ItemSlot has copy, drop, store { name: String }

// CORRECT
public struct DynamicFieldKey() has copy, drop, store;
public struct ItemKey(String) has copy, drop, store;