#V 14 bytes
Uses a reg-ex to do the substitution.  Kind of fun, because it's not a built-in.  I have a WAY more fun function that's less bytes, but it's not working the way I expected.

    ͨ-©½[^0].*/±1

[Verify Test Cases](https://tio.run/nexus/v#@3@499AK3UMrD@2NjjOI1dPSP7TR8P9/XTMzLlMuAy5DCwMDLl1LcwMA)