Step $01\mathrm{.}3-$ Write a method named getNextToken that returns the next token

Since getting the next token in the expression String is something we will want to do multiple times, let's write a method to do that for us$.$

getNextToken$($Scanner$)$ : String

Write a public static method that takes a Scanner as an argument and returns a String. When called and passed a Scanner, this method should check to see if there is another token available, and if so$,$ then it should extract and return that token.

Otherwise, it should return null.