```\\nfunction safeDecreaseAllowance(\\n    IERC20 token,\\n    address spender,\\n    uint256 value\\n) internal {\\n    unchecked {\\n        uint256 oldAllowance = token.allowance(address(this), spender);\\n        require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");\\n        uint256 newAllowance = oldAllowance - value;\\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\\n    }\\n}\\n```\\n