interface CETHInterface {
    function balanceOf(address) external view returns (uint);
    function mint() external payable; // For ETH
    function repayBorrow() external payable; // For ETH
    function borrowBalanceCurrent(address account) external returns (uint);
    function redeem(uint redeemAmount) external returns (uint);
}
function repayBorrow() external payable; // For ETH

// For ETH