Declare a public static method called charAt that takes a char array parameter, and an index parameter and returns the character from the array at the index specified. You can assume that the index is valid, i.e. between 0 and String.length0-1. Declare a public static method called indexof that takes a char array parameter, character parameter and returns the index in the character array of the first occurrence of that character or -1 if the character is not found. Declare a public static method called toUpperCase takes a char array parameter and returns a String with the contents of the character array converted to upper case. Do not change the contents of the character array