Liquidate: Calculate net token amounts |

We are mostly done with this function. We finished the liquidation loop, and now we need to calculate the exact amounts that need to be transferred to the liquidator.

First, we convert amounts to net amounts by multiplying with exchange prices:

actualDebtAmt_ = (currentData_.totalDebtLiq * memoryVars_.borrowExPrice) / EXCHANGE_PRICES_PRECISION;
actualColAmt_ = (currentData_.totalColLiq * memoryVars_.supplyExPrice) / EXCHANGE_PRICES_PRECISION;

The reason for doing this is that we previously converted from net to raw before we started the liquidation loop, as ratio calculation works with raw amounts:

// debtAmt_ should be less than 2**128 & EXCHANGE_PRICES_PRECISION is 1e12
unchecked {
    currentData_.debtRemaining = (debtAmt_ * EXCHANGE_PRICES_PRECISION) / memoryVars_.borrowExPrice;
}

Then we perform a few sanity checks, with this one being the most important:

if (((actualColAmt_ * 1e18) / actualDebtAmt_) < colPerUnitDebt_) {
    revert FluidVaultError(ErrorTypes.Vault__ExcessSlippageLiquidation);
}

We want to ensure that the liquidator receives enough collateral for liquidated debt by using his passed colPerUnitDebt_ value.

After this, we use the dead-address simulation trick mentioned earlier to revert with the calculated liquidation amounts:

if (to_ == 0x000000000000000000000000000000000000dEaD) {
    // revert with liquidated amounts if to_ address is the dead address.
    // this can be used in a resolver to find the max liquidatable amounts.
    revert FluidLiquidateResult(actualColAmt_, actualDebtAmt_);
}