```\\nfunction _approve(address owner, address spender, uint256 amount) private {\\n    require(owner != address(0), "ERC20: approve from the zero address");\\n    require(spender != address(0), "ERC20: approve to the zero address");\\n\\n    _allowances[owner][spender] = amount;\\n    emit Approval(owner, spender, amount);\\n}\\n```\\n