Update Day 5.md

[mhsiao345]

add new solution to question 16

[darkprinx]

Thanks for the solution! This diff adds a closing code fence but there's no opening fence before your code, so it isn't wrapped as a code block — and that stray closing fence ends up closing whatever block happens to come next in the file instead. Could you wrap your solution in its own python ... block (opening fence before '''Solution by: mhsiao345''', closing fence after your list comprehension line)?

[darkprinx]

Went ahead and merged this with your solution wrapped in its own python ... block (it previously had a closing fence with no matching opening one), and added a print() call since the list comprehension by itself produces no visible output when run as a script. Thanks for the contribution! 🎉