Remove head/tail usage as these are partial functions

[mihaimaruseac]

Description of the PR

Remove partial functions to resolve hlint suggestions that show up on every PR.

Checklist

• Add a changelog if necessary. See https://keepachangelog.com/ for how to write it.
• Add tests in TESTS.md if possible.

[mihaimaruseac]

Hmm, the other ones require more attention, sadly I cannot do that now. Will do a part 2 later

[toku-sa-n]

Thanks!