[API | Code] Refactor and Clean Code improvements

[AbreuHD]

The goal of this issue is to refactor and improve the API code following Clean Code best practices. A SonarQube analysis will be conducted to identify code quality issues, vulnerabilities, and potential improvements.

Tasks to be completed

• Analyze the code using SonarQube and review the generated reports.
• Fix issues related to:
  • Code duplication.
  • High cyclomatic complexity.
  • Coding style and standards.
  • Potential security vulnerabilities.

Acceptance criteria

• The code must meet the quality metrics defined by SonarQube.
• The API must retain its functionality without errors after the changes.
• Provide brief documentation on the key improvements implemented.

Additional notes

Any critical issues found during the process should be documented for future improvements.