Edit: Nevermind. This was a newbie question based on misunderstanding how the site works. Skip to the last edit at the bottom for clarification.
Much of the time, new OPs leave a question, get a hint in a comment or discover the answer on their own, and then never return. Those questions litter the unanswered questions pool. However, I have come across a number of questions where a new OP asked a good question, then discovered a good answer on their own and made the effort to close the loop by posting their solution. However, they lacked the rep to do it formally, so they had to leave it as a comment or embed the answer in the question, itself. These end up as bloat in the unanswered question pool unnecessarily. I think it would be good to encourage new posters to come back with an answer when they are able and willing to do so (it's win-win).
So my question is about the best way to get their answer into an answer. My understanding is that you don't gain any rep from accepting your own answer but you could benefit from any upvotes the answer receives. If that is correct, then a solution where someone else moves the information into an answer would not help the OP jump-start their rep.
I've seen some posts here about how easy it is to gain 15 points so it isn't a hurdle. That misses the point in this case. That encourages the situation where the question remains apparently unanswered until some future time when the OP will come back to it and clean it up, which might never happen.
If the OP has provided a good answer in the wrong place, it doesn't seem right for a scavenger to spend a few seconds moving it and then reap the rewards for the answer. It also shouldn't be a burden on someone in a moderator role to have to do all the cleanup work.
Is there a mechanism whereby a new OP can have their answer moved into an answer and get the credit for any upvotes? Can another user do that on their behalf? For those concerned about the 15 rep threshold, put any upvotes in the bank until the OP acquires 15 points by conventional means.
Edit: Right after writing this question, I saw that the example which triggered my question seemed to have a magical solution. Someone with 11 rep posted the answer to their own question. Is there an existing mechanism whereby a new OP can post an answer and it gets reviewed and approved for inclusion similar to edits made by someone with under 2K rep?
Edit: I asked this question when I was a relative newcomer on the site and apparently misunderstood the rep requirements. I would delete this question except Robotnik posted an answer with good advice. To set the record straight, users with any rep can post an answer. The 15 rep requirement is just to use the "answer your own question" button, which facilitates posting the question and answer concurrently. Nothing prevents a new questioner from posting an answer if they choose to, and the problem of questioners posting answers in the wrong place is a matter of educating them (and Robotnik's answer covers that).