A URL extension to insert a timestamp in the URL's file name

URL+Timestamp.swift

extension URL {
    // Inserts a timestamp into a URL's filename
    // e.g. "/path/to/file.ext" -> "/path/to/file~1587197384.ext"
    func addingTimestamp(separator: String = "~") -> URL {
        let timestamp = Int(Date().timeIntervalSince1970)
        let filename = deletingPathExtension().lastPathComponent + "\(separator)\(timestamp).\(pathExtension)"
        return deletingLastPathComponent().appendingPathComponent(filename)
    }
}