Scala:

Write a function called alternate that takes two List[Int] arguments and produces a List[Int]. The elements of the resulting list should alternate between the elements of the arguments. Assume that the two arguments have the same length. For example: alternate ( List (1 , 3, 5) , List (2 , 4, 6)) = List (1 , 2, 3, 4, 5, 6)