Update docs/assignments/week09.md, docs/assignments/week01.md, docs/assignments/week02.md, docs/assignments/week03.md, docs/assignments/week05.md, docs/assignments/week06.md, docs/assignments/week07.md, docs/assignments/week08.md, docs/assignments/week10.md, docs/assignments/week11.md, docs/assignments/week12.md, docs/assignments/week04.md