ch01/ex02: add test
ch01/ex02: add test fixture
ch01/ex03: add test
refactor
ch01/ex04: add test
git: add ignore files
ch01/ex05: skip
refactor
ch01/ex03: add comment
ch01/ex06: add test
ch01/ex07: add test
ch01/ex08: add test
ch01/ex09: add test
ch01/ex10: skip
skip
ch02: add exercises
add alice.txt
util: add List util
ch02/ex01: add test
ch02/ex02: add test