Thank you for reminding beginners to pay attention

The biggest problem with this UFO Pi Xiu contract is that it likes to deduct fees, basically ensuring profit without loss. Moreover, it initially set the owner for the illusion, set the _contractSender as the owner, and then transferred the owner rights, but the _contractSender was not transferred. In the end, there are many bug-prone behaviors in the code. At any disagreement, it can transfer funds to _contractSender.