add confirmDeletion(), confirms deletion

[chantca95]

Confirmation message will pop up upon deleting, asking users to confirm if they really want to delete.

*The new actual.txt and expected.txt are exactly the same, but performing runtests.bat and even FC actual.txt expected.txt shows this error:

Comparing files actual.txt and EXPECTED.TXT
***** actual.txt
|| Example: delete 1
||
|| ===================================================
***** EXPECTED.TXT
|| Example: delete 1
||
|| ===================================================

---

[damithc]

@chantca95 for this LO, it is enough to push your commits to your own fork. No need to create a PR.