Top-level statements must precede namespace and type declarations, on line 22, it says i cant use methods in a variable how else could i name the variable?

using UnityEngine;

public class NewMonoBehaviourScript : MonoBehaviour

{
    // Variables
    public float speed = 5.0f;
    public float turnspeed;


    

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {

    }
    }

    // Update is called once per frame
    void Update()
{
    public float horizontalInput;
    public float forwardInput;

    //Get the horizontal input
         horizontalInput = Input.GetAxis("Horizontal");
         forwardInput = Input.GetAxis("Vertical");
         
        //Move the vehicle forward continuously
        transform.Translate(Vector3.forward * Time.deltaTime * speed * forwardInput);
        transform.Translate(Vector3.right * Time.deltaTime * turnspeed * horizontalInput);
    }