/// Creates a new empty `String`.
///
/// Given that the `String` is empty, this will not allocate any initial
/// buffer. While that means that this initial operation is very
/// inexpensive, it may cause excessive allocation later when you add
/// data. If you have an idea of how much data the `String` will hold,
/// consider the [`with_capacity`] method to prevent excessive
/// re-allocation.
///
/// [`with_capacity`]: #method.with_capacity
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// let s = String::new();
/// ```
pub const fn new() -> String {
    String { vec: Vec::new() }
}