There will be two returns that will need to be filed depending on when the partnership ended in 2018.
You would need to file 1065 for the time the partnership was operational in 2018 i.e. 1/1/2018-6142018. Then you would take that K-1 and report it on your personal return.
Then you would file the Schedule C for the remaining time in the year that the business was operational.
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