Write a Java public static method called method40 that receives a String (s) and an integer number (n). It returns a String. If the number n is bigger than or equal to the lenth of the String s, the method returns the complete String s, but converted all to upper case.

on the other hand, if n is smaller than the length of s, but is a positive number, then the method returns the complete Strings, but converted all to lower case. If n is negative, the method returns empt String ("")