markLength4

Write a static method markLength4 that takes an
   ArrayList of Strings as a parameter and that places a String of four
   asterisks ("****") in front of every String of length 4.  For example,
   suppose that an ArrayList called "list" contains the following values:

        (this, is, lots, of, fun, for, every, Java, programmer)

   And you make the following call:

        markLength4(list);

   Then list should store the following values after the call:

        (****, this, is, ****, lots, of, fun, for, every, ****, Java, programmer)

   Notice that you leave the original Strings in the list (this, lots, Java)
   but include the four-asterisk String in front of each to mark it.  You may
   assume that the ArrayList contains only String values, but it might be
   empty.  Recall that the primary methods for manipulating an ArrayList are:

        add(Object value)		appends value at end of list
	add(int index, Object value)	inserts given value at given index,
					shifting subsequent values right
	get(int index)			returns the value at given index
	remove(int index)		removes value at given index, shifting
					subsequent values left
	set(int index, Object value)	replaces value at given index with
					given value
	size()				returns the number of elements in list

   Write your solution to markLength4 below.