Fixes: T348600

Proposed Changes

• The title/identifier should be displayed properly.
• The placeholder text should say "Enter valid identifier"
• The validation should accept either Alphabets, Numbers, or Alphanumeric characters
• Restructure and Move Identifier validation into server.js

Files Created/Updated

• components/Books.js - receive isInValidIdentifier response from server and implement frontend. Update the changeIdentifier placeholder
• server.js - validate identifier and return isInValidIdentifier: true if validation fails

Current Look

Checklist

• Coding Conventions are followed.
• Comments are used for Documenting the Code.
• Correct File Names are mentioned.