     /// - Parameters:
     ///   - element: The new element to insert into the array.
     ///   - index: The position at which to insert the new element.
-    func insert( _ element: Element, at index: Int) {
+    func insert(_ element: Element, at index: Int) {
         queue.async(flags: .barrier) {
             self.array.insert(element, at: index)
         }

    /// Adds new elements at the end of the array.
    ///
    /// - Parameter element: The elements to append to the array.
    func append( _ elements: [Element]) {
        queue.async(flags: .barrier) {
            self.array += elements
        }

    /// Adds a new element at the end of the array.
    ///
    /// - Parameter element: The element to append to the array.
    func append(_ element: Element) {
        queue.async(flags: .barrier) {
            self.array.append(element)
        }
