How to delete a file in USER PROFILE using swift code

This is the code that works very well but need to enter the correct path as USER PROFILE : UserName

let filePathString = "file:///Users/UserName/.ssh/known_hosts"
            guard let fileUrl = URL(string: "\(filePathString)") else { return }

            do {
                try FileManager.default.removeItem(at: fileUrl)
                print("Remove successfully")

            }
            catch let error as NSError {
                print("An error took place: \(error)")
            }

How to set UserName as a variable? Thanks, everybody!