  function withdraw(
    IERC4626 vault,
    address to,
    uint256 amount,
    uint256 maxSharesOut
  ) public payable virtual override returns (uint256 sharesOut) {

    ERC20(address(vault)).safeApprove(address(vault), amount);
    if ((sharesOut = vault.withdraw(amount, to, msg.sender)) > maxSharesOut) {
      revert MaxSharesError();
    }
  }
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
  function withdraw(
    IERC4626 vault,
    address to,
    uint256 amount,
-   uint256 maxSharesOut
+  uint256 maxSharesIn
  ) public payable virtual override returns (uint256 sharesOut) {
+   ERC20(address(vault)).safeApprove(address(vault), maxSharesIn);
+   if ((sharesIn = vault.withdraw(amount, to, msg.sender)) > maxSharesIn) {
-   ERC20(address(vault)).safeApprove(address(vault), amount);
-   if ((sharesOut = vault.withdraw(amount, to, msg.sender)) > maxSharesOut) {
      revert MaxSharesError();
    }
+   ERC20(address(vault)).safeApprove(address(vault), 0);

  }
