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Avoiding Common Attacks

SWC-104 (Unchecked Call Return Value)

The return value from a call to the ticket owner's address in cancelTicket is checked with require to ensure transaction rollback if call fails.

SWC-105 (Unprotected Ether Withdrawal)

withdraw is protected with OpenZeppelin Ownable's onlyOwner modifier.

SWC-107 (Reentrancy)

Perform internal state change in cancelTicket before making the call.