Allow capitalizing, rename exception, declare var
Add ex 3 length function for list or string
Add ex 9 is_member function
Reformat to multiline comments in user-defined fxn
Reformat to multiline comments and fix indentation
Reformat multiline comments
Rename variables
Add ex 10 overlapping function
Add ex 11 generate n chars function
Add user input option and exception handlers
Rename exception class
Add ex 12 histogram function
Highlight finished exercises to keep track