function clean-unzip --argument zipfile
    if not test (echo $zipfile | string sub --start=-4) = .zip
        echo (status function): argument must be a zipfile
        return 1
    end

    if is-clean-zip $zipfile
        unzip $zipfile
    else
        set folder_name (echo $zipfile | trim-right '.zip')
        set target (basename $folder_name)
        mkdir $target || return 1
        unzip $zipfile -d $target
    end
end