fn pop(&mut self) -> i32 {
        let len = self.v.len();
        for i in 0..len-1 {
            let temp = self.v.pop_front().unwrap();
            self.v.push_back(temp);
        }
        self.v.pop_front().unwrap()
    }
/** Removes the element on top of the stack and returns that element. */
Removes the element on top of the stack and returns that element.
Removes the element on top of the stack and returns that element .
fn pop(&mut self) -> i32 {
        let len = self.v.len();
        for i in 0..len-1 {
            let temp = self.v.pop_front().unwrap();
            self.v.push_back(temp);
        }
        self.v.pop_front().unwrap()
    }
fn pop ( & mut self ) -> i32 { let len = self . v . len ( ) ; for i in 0 .. len - 1 { let temp = self . v . pop_front ( ) . unwrap ( ) ; self . v . push_back ( temp ) ; } self . v . pop_front ( ) . unwrap ( ) }
Removes the element on top of the stack and returns that element.
Removes the element on top of the stack and returns that element .
&mut self