Update App.js

[Ishaan28malik]

Using a switch case

Description: I replaced the if-else condition to make the code more efficient

Please ensure Checkmark the following :

• [x] - Tested Localy
• [x] - Checked in IE11 and Firefox
• [ ] - Checked in mobile
• [ ] - Backend work
• [x] - Frontend work
• [ ] - Bug Fixes
• [x] - Enhancements

[Ishaan28malik]

@shakti97 I made those changes in another PR.