05AB1E, 63 bytes
„Uuõª„LLæDl«âDí«JêéRʒ®så}нõ.;Ðć_iDćl'xQiA6£Du«м.ïë\7ÝKõQë\þQ}yõÊ*
This isn't too easy without regexes.. :/ Can definitely be golfed a bit more, though.
Try it online or verify all test cases.
Explanation:
TODO: Working on it.
Kevin Cruijssen
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