interface itoken {
    function freezeAccount(address _target, bool _freeze) external;
    function freezeAccountPartialy(address _target, uint256 _value) external;
    function balanceOf(address _owner) external view returns (uint256 balance);
    // function totalSupply() external view returns (uint256);
    // function transferOwnership(address newOwner) external;
    function allowance(address _owner, address _spender) external view returns (uint256);
    function initialCongress(address _congress) external;
    function mint(address _to, uint256 _amount) external returns (bool);
    function finishMinting() external returns (bool);
    function pause() external;
    function unpause() external;
}
function allowance(address _owner, address _spender) external view returns (uint256);
// function totalSupply() external view returns (uint256);
// function transferOwnership(address newOwner) external;