Complete the Java helper method countEmptyString to count the number of empty strings in an array of strings using recursion.

You must not use any loops or regular expressions. Submissions with loops or regular expressions will not pass.

For example:

Test	Result
String[] arr1 = {"123", "", "abc"}; System.out.println(countEmptyString(arr1));	1
String[] arr2 = {"", "", "", ""}; System.out.println(countEmptyString(arr2));	4