pub fn get(&self, index: usize) -> Option<&T> {
        if index < self.len() {
            let idx = self.wrap_add(self.tail, index);
            unsafe { Some(&*self.ptr().add(idx)) }
        } else {
            None
        }
    }
Reserves the minimum capacity for exactly `additional` more elements to be inserted in the
given `VecDeque`. Does nothing if the capacity is already sufficient.

Note that the allocator may give the collection more space than it requests. Therefore
capacity can not be relied upon to be precisely minimal. Prefer [`reserve`] if future
insertions are expected.

# Panics

Panics if the new capacity over
benchmarks/haystacks/code/rust-library.rs