var myNumbers3 = [4, 11, 32, 5, 19]
func addByTwo(_ input: inout [Int]) -> [Int] {
    for i in 0..<input.count {
        input[i] += 2
    }
    return input
}
print(addByTwo(&myNumbers3))
print(myNumbers3)
// => [6, 13, 34, 7, 21]