```\nfunction _takeWalletFee(uint256 tWallet) private {\n    uint256 currentRate = _getRate();\n    uint256 rWallet = tWallet.mul(currentRate);\n    _rOwned[address(this)] = _rOwned[address(this)].add(rWallet);\n    if (_isExcluded[address(this)])\n        _tOwned[address(this)] = _tOwned[address(this)].add(tWallet);\n}\n```\n