a) Refactor (rewrite the code) that is better testable

b) develop control flow graph from the refactored code and develop test cases based on your graph.

c) compare and contrast the testability of the refactored code and the old change.java program (write a small paragraph comparing the CGFs and the quality of test cases)

import java.util.Scanner; public class change { public static void main(String[] args) { Scanner scan = new Scanner(System.in); double cost, paidAmount; int[] changes = new int[5]; System.out.println("Please enter the cost:"); cost = scan.nextDouble(); System.out.println("Please enter the paid amount:"); paidAmount = scan.nextDouble(); changes=changeCalc(paidAmount, cost); for(int i=0; i<5 ; i++) { system.out.println(changes[i]); } public static int[] changecalc(double paid, double cost) int change =(int)((paid - cost)*100.0); dollars =0, quarters =0, dimes =0, nickles=0, pennies=0; changes=new int[5]; if(change> 0) { dollars=change/100; changes[0]=dollars; change = change%100; quarters = change/25; changes[1]=quarters; change = change%25; dimes = change/10; changes[2]=dimes; change = change%10; nickles = change/5; changes[3]=nickles; pennies = change%5; changes[4]=pennies; } return changes; } }