Is it possible to add withdraw tokens/transfer from vesting contract?

This is the contract:https://github.com/laronlineworld/vestingcontract/blob/main/VestingContract.sol

Is it possible to add withdraw/transfer token from vesting contract? And the access is for owner only.

I think you can add whatever feature you want, but you need to test when adds new feature.

Just inherit this contract: openzeppelin-contracts/Ownable.sol
and add modifier onlyOwner for your new function.