exercise for 2-1
Merge branch 'master' of github.com:unofficial-7-languages-book-club/seven-languages-in-seven-weeks
Merge branch 'master' of github.com:unofficial-7-languages-book-club/seven-languages-in-seven-weeks
Merge branch 'master' of github.com:unofficial-7-languages-book-club/seven-languages-in-seven-weeks