Use new shorthand syntax for unwrapping optionals

[sheikhbayazid]

Use new shorthand syntax for unwrapping optional values

Motivation:

Using new shorthand syntax would make the code easier to read. Since we have the support to add the shorthand syntax for guard let and if let, it makes the code more readable.

Modifications:

Instead of using if let value = value, used if let value same goes for guard let.

Result:

There is no change of any logic. Just improved the better syntax of unwrapping optionals.

[MaxDesiatov]

Seems legit, thanks!

[MaxDesiatov]

@swift-ci smoke test

[tomerd]

thanks @sheikhbayazid