Create a function that returns the original value from a list with too many sub-lists.
de_nest([[[[[[[[[[[[3]]]]]]]]]]]]) ➞ 3
de_nest([[[[[[[True]]]]]]]) ➞ True
de_nest([[[[[[[[[[[[[[[[["edabit"]]]]]]]]]]]]]]]]]) ➞ "edabit"You only need to retrieve one element.