The pacman.conf is OK now.
The conflicting files error is known, but unfortunately in my opinion out of our reach.
It has already been notified at least a couple of times recently.
Here you can see my point of view: in a few words, ttf-google-fonts-git and ttf-carlito should "conflict" (so the system should allow installing only one of them), but they don't.
The latter, is a more "official" package, in the Arch repo, up-to-date, and required by LibreOffice.
The former is in the AUR repo, not maintained since a long time, but unfortunately required by several packages.
I really wouldn't know how to resolve this issue. Ideally I would say to remove ttf-google-fonts-git, however, if you have it, it means that most likely it is required by another package... So you should decide if this other package is important to you and possibly remove it.
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