Optimising String access for efficient usage using enums

[vatsalkul]

Description

I have organised the constants in Utilities/Strings.swift into appropriate enums.
It will result in efficient access and identification of data throughout the app.

Fixes #222

Type of Change:

• Code

Code/Quality Assurance Only

• Code Refactoring

How Has This Been Tested?

All the functionality of app is working and tased on iPhone simulator.

Checklist:

• My PR follows the style guidelines of this project
• I have performed a self-review of my own code or materials

Code/Quality Assurance Only

• My changes generate no new warnings

[sunjunkie]

I’m still thinking about this. The enum naming is not ideal.

[vatsalkul]

As I gone through the Strings.swift file, I also noticed that there is a scope of organising strings in the related groups. After all, It depends upon the developer what kind of style they want to follow. 😇