This app does just what you want it to do - cut out the parts at the beginning and end of a video you don’t want, and extracts the snippet without decreased quality. You can immediately save it, message it, email it, etc.
When you open it and when you want to save it or perform another action, an ad pops up that you can close immediately. That’s it. Small price to pay for a free simple app. I am thinking about paying to unlock additional features also.