Zip Files from directory without creating a directory inside zip directory

I'm working with Swift 5.0 and I want to zip 3 files without installing additional dependencies.

Currently I'm able to zip 3 Files, which all are in the same directory, called "root". But if I open the created and exported zip-file (named: final.zip), than I get the folder (root) in which the 3 files were saved. I don't want this "root" folder inside my final.zip. I want to see my data directly inside the final.zip Below is the code.

let fm = FileManager.default
let baseDirectoryUrl = fm.urls(for: .documentDirectory, in: .userDomainMask).first!.appendingPathComponent("root", isDirectory: true)

if !fm.fileExists(atPath: baseDirectoryUrl.relativePath) {
  try! fm.createDirectory(
    at: baseDirectoryUrl,
    withIntermediateDirectories: true,
    attributes: nil
  )
}

// path of data
let data1_path = baseDirectoryUrl.appendingPathComponent("data1.vec3")
let data2_path = baseDirectoryUrl.appendingPathComponent("data2.vec3")
let data3_path = baseDirectoryUrl.appendingPathComponent("data3.json")

// write wData1 to data1_path
try! wData1.write(to: data1_path)

// write wData2 to data2_path
try! wData2.write(to: data2_path)

// write wData3 to data3_path
try! wData3.write(to: data3_path)


// this will hold the URL of the zip file
var archiveUrl: URL?
// if we encounter an error, store it here
var error: NSError?

let coordinator = NSFileCoordinator()
// zip up the root directory
// this method is synchronous and the block will be executed before it returns
// if the method fails, the block will not be executed though
// if you expect the archiving process to take long, execute it on another queue

coordinator.coordinate(readingItemAt: baseDirectoryUrl, options: [.forUploading], error: &error) { (zipUrl) in
  // zipUrl points to the zip file created by the coordinator
  // zipUrl is valid only until the end of this block, so we move the file to a temporary folder
  let tmpUrl = try! fm.url(
    for: .itemReplacementDirectory,
    in: .userDomainMask,
    appropriateFor: zipUrl,
    create: true
  ).appendingPathComponent("export.zip", isDirectory: false)
  try! fm.copyItem(at: zipUrl, to: tmpUrl)

  // store the URL so we can use it outside the block
  archiveUrl = tmpUrl
}


if let archiveUrl = archiveUrl {
  // bring up the share sheet so we can send the archive with AirDrop for example
  let avc = UIActivityViewController(activityItems: [archiveUrl], applicationActivities: nil)
  avc.popoverPresentationController?.barButtonItem = navigationItem.rightBarButtonItem
  present(avc, animated: true)
} else {
  print(error)
}

I'm glad for everybody who can help