ruby/secret-handshake (init)
ruby/secret-handshake (#1)
ruby/secret-handshake (#2) refactoring
ruby/linked-list (init)
ruby/linked-list (#1)
ruby/linked-list (#2) add more tests
ruby/linked-list (#3) small refactoring
ruby/wordy (init)
ruby/wordy (#1)
ruby/wordy (#2) refactorings