The NFT owner is able to set the available_period: Vec<String> but it never gets checked in this contract.
https://github.com/code-423n4/2024-10-coded-estate/blob/main/contracts/codedestate/src/execute.rs#L1300
https://github.com/code-423n4/2024-10-coded-estate/blob/main/contracts/codedestate/src/execute.rs#L742
