fixed : simplify children() with safe casting and null handling

[ADITYA-KUMAR-2358]

• Simplified logic by removing redundant Stream.ofNullable().findAny().stream()
• Added instanceof check to avoid ClassCastException
• Return Stream.empty() when key is null or not a List
• Added comments to understand the logic of changes made

[github-actions]

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📥 Commits

Analyzing changes from base (ede37bd) to latest commit (cb1a4d9):

• cb1a4d9: Indentation and Added instanceof checks to prevent ClassCastException
• e0b9df4: applied spotless formatting"
• 06ab653: fix: simplify children() with safe casting and null handling

📁 Files being considered (2)

🔄 abstract-document/src/main/java/com/iluwatar/abstractdocument/AbstractDocument.java (3 hunks)
➕ tyle apply spotless formatting (2 hunks)

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[ADITYA-KUMAR-2358]

Hi maintainers, I’ve raised a PR #3327 related to this issue as part of Hacktoberfest 2025. If it looks good, I’d be grateful if you could review and merge it. If merging isn’t possible right now, could you please add the “hacktoberfest-accepted” label to the PR so it can count towards my Hacktoberfest contributions? Thanks a lot for your time and support!