Short the following require messages

[code423n4]

Handle

robee

Vulnerability details

The following require messages are of length more than 32 and we think are short enough to short
them into exactly 32 characters such that it will be placed in one slot of memory and the require
function will cost less gas.
The list:

    Solidity file: LimboDAO.sol, In line 272, Require message length to shorten: 35, The message: LimboDAO: voting on proposal closed
    Solidity file: FlashGovernanceArbiter.sol, In line 143, Require message length to shorten: 40, The message: Limbo: Flashgovernance decision pending.
    Solidity file: Flan.sol, In line 96, Require message length to shorten: 37, The message: ERC20: transfer from the zero address
    Solidity file: Flan.sol, In line 103, Require message length to shorten: 38, The message: ERC20: transfer amount exceeds balance
    Solidity file: Flan.sol, In line 97, Require message length to shorten: 35, The message: ERC20: transfer to the zero address
    Solidity file: UniswapHelper.sol, In line 94, Require message length to shorten: 36, The message: Uniswap factory hardcoded on mainnet
    Solidity file: FlanBackstop.sol, In line 102, Require message length to shorten: 38, The message: BACKSTOP: potential price manipulation

[jack-the-pug]

Dup #185