docs: fix outdated Solidity syntax in contract

[lipperhey]

Description

updated the contract to match current Solidity standards.

• replaced constant with view
• changed returns (string) to returns (string memory)

this resolves compilation warnings on newer Solidity versions.

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[wackerow]

https://docs.soliditylang.org/en/v0.8.30/contracts.html#view-functions

Lgtm! Thanks @lipperhey

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[wackerow]

@all-contributors please add @lipperhey for maintenance

[allcontributors]

@wackerow

I've put up a pull request to add @lipperhey! 🎉