Fix memory leak

[JoukoVirtanen]

Currently threads created in run_payload are not closed resulting in a memory leak. This PR fixes that.

This PR also fixes a memory leak resulting from CString::new(format!("{base}/{uniq}")).unwrap().into_raw().

[Molter73]

[ultra-nit] We might want to put this in a new type and add something like .inc and .dec methods to remove some verbosity in the loop. But honestly, this way is fine as well.

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