Unused local variables

[code423n4]

Handle

WatchPug

Vulnerability details

Unused local variables in contracts increase contract size and gas usage at deployment.

Instances include:

https://github.com/Badger-Finance/ibbtc/blob/d8b95e8d145eb196ba20033267a9ba43a17be02c/contracts/Zap.sol#L177-L179

function calcMintWithRen(uint amount) public view returns(uint poolId, uint idx, uint bBTC, uint fee) {
    uint _ibbtc;
    uint _fee;
    ...

https://github.com/Badger-Finance/ibbtc/blob/d8b95e8d145eb196ba20033267a9ba43a17be02c/contracts/Zap.sol#L196-L198

function calcMintWithWbtc(uint amount) public view returns(uint poolId, uint idx, uint bBTC, uint fee) {
    uint _ibbtc;
    uint _fee;
    ...

https://github.com/Badger-Finance/ibbtc/blob/d8b95e8d145eb196ba20033267a9ba43a17be02c/contracts/Zap.sol#L274-L275

uint _fee;
uint _ren;

https://github.com/Badger-Finance/ibbtc/blob/d8b95e8d145eb196ba20033267a9ba43a17be02c/contracts/Zap.sol#L295-L296

uint _fee;
uint _wbtc;

[tabshaikh]

fixed, duplicate of #6