lender-erc-20-redeem

    function redeem(uint256 amount) public {
        ERC20 thisContract = ERC20(address(this));
        require(thisContract.transferFrom(msg.sender, address(this), amount), 'Please redeem');
        if(_closed) {
            uint256 toTransfer = amount * _lenderEth / _totalSupply;
            msg.sender.transfer(toTransfer);
            toTransfer = amount * _lenderCollateral / _totalSupply;
            daiContract.transfer(msg.sender, toTransfer);
        }
    }