Swift - iOS Xcode 9.4

Write a function that:

- takes in an array of integers and separates each element of the array into odd and even numbers

- then splits the array into lists that are sorted in DESCENDING order (largest first, smallest last)

- finally, your function should return the sorted evens and odds as a tuple

- Each element in the array COULD be nil. So you will have to figure out how to represent that in the parameter's type.

- If an element in the array is nil, do nothing with it.

- Don't forget edge cases like an empty data or all nil values.

Notes:

- Research how to return multiple values (as a named tuple) from Swift functions

- DO NOT manually sort the integers; find a better way using Swift's libraries!

- Your function MUST work with the commented out function calls below!

//let sortedNumbers = sortedEvenOdd(numbers: [0, 9, 3, nil, 8, 15, 11, 2, 20, nil])

//print(sortedNumbers.evens) // [20, 8, 2, 0]

//print(sortedNumbers.odds) // [15, 11, 9, 3]