How to unpack contents of each top$-$level ZIP archive in the current directory, one at a time into a new subdirectory named after the original archive in freebsd.

And after,in the subdirectories, extract and identify each individual archives. These archives should be extracted into directories named after username. Repeat for every archive inside the current subdirectory, non$-$archive files should be ignored. After each individual archive has been extracted to a folder, the original archive file can be deleted. Repeat for every top$-$level ZIP archive in the current directory, once all top$-$level archives have been extracted, the script may exit.