implement the following method:

public static String replacement(String ori, String r, String w)

this method should replace all occurrence of the String r with String w if the total length of String r (number of occurrences X r.length())

is less than 30% of the length of ori String; otherwise, you are going to replace all occurrences of w with r. Then return a String after

applying these rules. for example

replacement ("skiing is fun", "fun", "cool") should return "skiing is cool"

replacement ("AAABB", "A", "C") should return "AAABB"