Finished exercise 0
Finished Exercise1 to count array elements
Finished Exercise 2 and refactored old Exercises
Finished Exercise 3, find sum of array
Finished exercise 4, return max number of array
Finished Exercise 5, testing puts output
Finished exercise 6, change last element of array
Finished Exercise 7, sees if array incudes string
Finished Exercise 8, prints values of nested hashes
Finished Exercise 9, leap year determiner
Refactoring and such