- Solution for exercises 1-6 from chapter 04 - Maps.
- Added file needed by the exercises.
- Solution for exercises 7-10 from chapter 04 - Maps.
- Solution for exercises 1-5 from chapter 05 - Classes.
- Convert all variables to val when possible.
- Solution for exercises 6-10 from chapter 05 - Classes.
- Add Java version of the Car class needed in the exercise 9.