fix: Update land id logic.

[Birdmannn]

Detailed Information

--- Update in the land id creation returned from the smart contract's register_land after registering a new land parcel.

Related Issues

The target function returns a very long u256 integer. Assignment was to still make this random, but shorter.
Closes #235

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Type of Change

• [ -] 🐛 Bug fix / ⚙️ enhancement: Updated the land ID generation logic.
• [ -] ✨ New feature or Chore: Re-wrote the function, modified its implementation to ensure absolute uniqueness between all generated id. Halved the previous size to the UUID standard of 32 digits. Added a new variable to the Storage structure for highly impossible (but not impossible) situations to avoid future panics. Resolved a test case to ensure all tests pass.

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Checklist (select as many as applicable)

• [- ] The code follows the style guidelines of this project.
• [ -] All new and existing tests pass.
• [ -] This pull request is ready to be merged and reviewed.