How to convert iPhone video's file to mp3 file (.mp3)?

For an assignment I had to make a recording of a song and it has to be.mp3; I recorded it on my iPhone as a video but I can't seem to find a way to convert it into.mp3

What I do is send it to myself, open it via email on a computer, save it somewhere, then add/change the ending to.mp3. Then you can send it back to yourself and put it on your phone.
Or,
you can just connect it to your computer via the cord you are given when you buy the phone

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