Add tests for the to_hex and the to_hex_trimmed

[Marchand-Nicolas]

Description 📹

Add tests for the "to_hex" and the "to_hex_trimmed" functions (from the utils folder) like we’ve done in tests/endpoints.rs

Proposed Actions 🛠️

Here’s a checklist of actions to follow for resolving this issue:

1. Fork and Create Branch:
   Fork the repository and create a new branch using the issue number:

   git checkout -b fix-[issue-number]

2. Implement Changes:

• Create a "utils.rs" file in the tests folder
• Fill it with the two requested tests
• You can reuse the way we've done tests in tests/endpoints.rs*

3. Run Tests and Commit Changes:
   Make sure your changes don't break existing functionality and commit with a clear message:

   git commit -m "Fix: [Short description of the fix]"

Required 📋

To keep our workflow smooth, please make sure you follow these guidelines:

• Assignment: Don't create a pull request if you weren’t assigned to this issue.
• Timeframe: Complete the task within 3 business days.
• Closing the Issue: In your PR description, close the issue by writing Close #[issue_id].
• Review Process:
  • Once you've submitted your PR, change the label to "ready for review".
  • If changes are requested, address them and then update the label back to "ready for review" once done.
• Testing: Test your PR locally before pushing, and verify that tests and build are working after pushing.

Thank you for your contribution 🙏

⚠️ WARNING: Failure to follow the requirements above may result in being added to the OnlyDust blacklist, affecting your ability to receive future rewards.

[GideonBature]

Greetings @Marchand-Nicolas, can you please assign this issue to me?

I am a software engineer and have participated and contributed to previous ODHacks. I would love to contribute once again to Starknet by solving this issue. I have experience writing Rust code and tests using some of it's framework (Axum and Actix-web). For this project, I will send my first PR within 72 hrs.

Thank you.