interface IUniswapV2Factory
event PairCreated(address indexed token0, address indexed token1, address pair, uint256)
function feeTo() external view returns (address)
function feeToSetter() external view returns (address)
function getPair(
address tokenA,
address tokenB
) external view returns (address pair)
function allPairs(uint256) external view returns (address pair)
function allPairsLength() external view returns (uint256)
function createPair(
address tokenA,
address tokenB
) external returns (address pair)
function setFeeTo(address) external
function setFeeToSetter(address) external
