Git

Remove first commit

A-B-C --> AB-C

git rebase -i A

It is possible to start like that if you continue with edit rather than squash:

edit e97a17b B
pick asd314f C

then run

git reset --soft HEAD^
git commit --amend 
git rebase --continue

Find deleted file path

git log --diff-filter=D --summary | grep delete

Find deleted file commit

git log --all -- <path-to-file>