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feat(margin-app): Lender Withdraw Function #690

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dlaciport
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Closes #580

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@faurdent faurdent left a comment

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Two small changes, everything else looks good.

let user_treasury_amount = self.treasury_balances.entry((withdrawer, token)).read();
assert(amount <= user_treasury_amount, 'Insufficient user treasury');

self.treasury_balances.entry((withdrawer, token)).write(user_treasury_amount - amount);
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Well-handled reentrancy!

Comment on lines +79 to +80
let token_dispatcher = IERC20Dispatcher { contract_address: token };
token_dispatcher.transfer(withdrawer, amount);
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I think it can be one-lined. The number of lines with code will count for the audit price.

Comment on lines +82 to +83
let pool_value = self.pools.entry(token).read();
self.pools.entry(token).write(pool_value - amount);
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Same

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[MarginContract] Lender Withdraw Function
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