2.20 Ch 2 Program, part 3: Refactoring Calculating Fuel Cost (Java) This lab section is focusing on implementing and calling methods. This is a critical concept of the course. If you are having trouble with this step, please seek help from Piazza and the TA/Instructors during office hours. In programming, the term refactoring means to review and re-write your code to improve its quality. That is, code refactoring improves the quality of the code, but it doesn't change its functionality. For part 3: (1) Copy your code from part 2 (Calculate Fuel Cost) and refactor it to use the following four methods. DO NOT CHANGE THE METHOD HEADERS!