I'm travelling to Switzerland and France on a tourist (Schengen-C visa). The visa was issued by Switzerland (for 15 days), but my return flight is from Paris.
In the hypothetical case that I'm positive for Covid (or have another medical emergency) and its inevitable I have to overstay my visa whom should I contact for a visa extension or any other indemnifying document. Should it be Swiss authorities or the French authorities and which department?