[Rust] Implementing Clone trait for Vector class.

// Currently, Copy trait cannot be implemented
// impl<T> Copy for Vector<T> {}

impl<T> Clone for Vector<T> where T: Copy + fmt::Display + num::Num {
     fn clone(&self) -> Vector<T> {
         let mut vec: Vec<T> = Vec::new();

         for i in 0..(self.vec.len()) {
             vec.push(self.vec[i]);
         }

         Vector::<T>{ vec: vec }
     }
 }