Let's assume I
merge git and there is a merge conflict.
My question is: how can I force git to always choose the newer version of code in conflict so I won't need to resolve the conflict by hand?
It is not exactly the "newer" version, but you can tell git to always prefer the version on the current branch using
git merge branch -X ours, or to prefer the version of the branch being merged, using
git merge branch -X theirs.
This option forces conflicting hunks to be auto-resolved cleanly by favoring our version. Changes from the other tree that do not conflict with our side are reflected to the merge result. For a binary file, the entire contents are taken from our side.
This is the opposite of "ours".