Added new function and test for it

[it-blockchain]

Motivation

Describe why this issue should be fixed and link to any relevant design docs, issues or other relevant items.

Change Summary

Describe the changes being made in 1-2 concise sentences.

Merge Checklist

Choose all relevant options below by adding an x now or at any time before submitting for review

• The PR title adheres to the conventional commits standard
• The PR has been tagged with change type label(s) (i.e. documentation, feature, bugfix, or chore)
• The PR's changes adhere to all the requirements in the contribution guidelines
• All commits have been signed

Additional Context

If this is a relatively large or complex change, provide more details here that will help reviewers.

---

PR-Codex overview

This PR adds a new function newFunction to MyContract that returns a greeting message. It also adds a test for newFunction in TestMyContract.

Detailed summary

• Added newFunction to MyContract returning a greeting message
• Added a test for newFunction in TestMyContract

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}