fixed bug for duplicate username

[lkimdaryl]

Abstract

This PR fixes the duplicate username bug. In the backend, it checks for already existing username and raises an exception if it already exists. In the frontend, changes were made to sync up the changes. Users are alerted if the update was not successful.

Closes #84

Type of Change

• Bug fix (non-breaking change which fixes an issue)

• Testing

  Manually tested

Checklist

• [ ] The code is understandable.
  • [ ] The code is follows formatting conventions (spacing, indents, etc).
  • [ ] The code makes use of names that sound like behavior.
  • [ ] The code is commented in hard-to-understand areas.
  • [ ] The code is correct.

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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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