. Complete the following function that reorders the contents of a vector so they are reversed from their original order. For example, a vector containing the elements 2, 6, 2, 5, 0, 1, 2, 3 would be transformed into 3, 2, 1, 0, 5, 2, 6, 2. Note that your function must physically rearrange the elements within the vector, not just print the elements in reverse order.

void reverse(std::vector& v) {

// Add your code...

}