- Instead of checking for nil using guard statements we are using self and some basic conditions
- This optimises the performance significantly considering that collection size can be bigger and checking using guard can be expensive.
- Changes in `OptionalExtensions.swift`

- Instead of checking for nil and empty using guard statements we are using self and some basic conditions

- This optimises the performance significantly considering that collection size can be bigger and checking using guard can be expensive.

- Changes in `OptionalExtensions.swift`

- Instead of force unwrapping, a default value is provided in the implementation of `isNilOrEmpty` property.