[feature] Error Handling

[El-swaggerito]

🧩 Title

Improve contract error handling

📄 Description

Define and implement structured error handling to make contract failures predictable and safe.

⚙️ Requirements

• Create custom error types
• Handle insufficient balance
• Handle invalid inputs
• Return meaningful error messages

✅ Acceptance Criteria

• Errors are consistent and descriptive
• Contract fails gracefully without breaking state

🏷️ Labels

enhancement, smart-contract, intermediate

[GEEKYFOCUS]

@GEEKYFOCUS has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi team,

I’ll implement a structured error handling system to make contract failures predictable and safe. This will involve defining custom error types that clearly represent scenarios like insufficient balance, invalid inputs, and other edge cases. I’ll ensure all contract functions consistently return meaningful errors instead of generic failures, making it easier to debug and integrate with external systems.

I’ll also verify that all failure paths exit cleanly without mutating state, preserving contract integrity. The goal is to make error handling standardized, descriptive, and aligned with best practices for secure and maintainable smart contract development.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @GEEKYFOCUS to this issue.

[drips-wave]

Congratulations, @GEEKYFOCUS! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @GEEKYFOCUS: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊