Resolve 2 Critical Sonar Code Smells

[sims-keshri]

Resolved following two sonar critical code smells:

1. Define a constant instead of duplicating this literal 'Space rocket <' 4 times.
2. Define a constant instead of duplicating this literal "> launch complete" 3 times.

[ohbus]

Please check CI reports for failing issues

[sims-keshri]

Sorry for the duplication. I raised a different PR for every sonar fix that I did. All the three PRs have a different fix.

This one resolves the following two:
Define a constant instead of duplicating this literal 'Space rocket <' 4 times.
Define a constant instead of duplicating this literal "> launch complete" 3 times.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[sims-keshri]

@ohbus Have fixed the checkstyle violation.

[sims-keshri]

hello @ohbus please review the PRs as I would like to make more contributions once these get approved. Thanks

[ohbus]

As the changes are duplicates, carrying them forward.

Closing this in favor of #1833