Write a method that returns the average length of all words in the string str. Use the same helper methods as in Exercise E5.7.

Data from Exercise E5.7.

Write a method

public static int countWords(String str) that returns a count of all words in the string str. Words are separated by spaces. For
example, countWords(" Mary had a little lamb") should return 5. Your method should work correctly if there are multiple spaces between words. Use helper methods to find the position of the next space following a given position, and the position of the next non-space character following a given position.