cleanup(backend): rename Validetor utility to Validator and utilize validator library (fix #127)

[Pratyush-Panda-2006]

Description

This pull request cleans up the backend validation logic. It fixes a spelling typo in the validator helper file name (renaming Validetor.js to Validator.js) and updates its import path in userAuth.js. Furthermore, it replaces custom email and password length regular expression checks with standard methods from the imported validator package.

Changes

• Renamed backend/src/Utils/Validetor.js to backend/src/Utils/Validator.js and updated imports in backend/src/controllers/userAuth.js.
• Refactored validation functions to use validator.isEmail and validator.isLength alongside strict type validations.

Fixes #127

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📥 Commits

Reviewing files that changed from the base of the PR and between a3fcb95 and 11337e2.

📒 Files selected for processing (3)

• backend/src/Utils/Validator.js
• backend/src/Utils/Validetor.js
• backend/src/controllers/userAuth.js

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