infinite jump

hey guys , i got infinite jumping in my unity project but i dont want it . i tried a code from a tutorial but it doesnt work . here it is

using UnityEngine.InputSystem;
using UnityEngine;
using System.Collections;
using System.Collections.Generic;


public class PlayerController : MonoBehaviour
{
    [Header("Horizontal Movement Settings")]
    // variable
    private Rigidbody2D rb;
    [SerializeField] private float walkspeed = 10;
    private float xAxis;
   
    [Header("ground check settings")]
    [SerializeField] private float jumpForce = 45;
    [SerializeField] private Transform GroundCheckPoint;
    [SerializeField] private float groundCheckY = 0.2f;
    [SerializeField] private float groundCheckX = 0.5f;
    [SerializeField] private LayerMask whatIsGround;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    // Update is called once per frame
    void Update()
    {
        getInputs();
        move();
        jump();

        if (Input.GetButtonDown("Jump"))
        {
            rb.linearVelocity = new Vector2(rb.linearVelocity.x, jumpForce);
        }
    }

// Permet de recevoir les touches presse par le joueur et leur attribues une action
    void getInputs()
    {
        xAxis = Input.GetAxisRaw("Horizontal");
    }


    void move()
    {
        rb.linearVelocity = new Vector2(walkspeed * xAxis, rb.linearVelocity.y);
    }

    public bool Grounded()
    {            //permet de verifier si le joueur est sur une plateforme ou non
        if (Physics2D.Raycast(GroundCheckPoint.position, Vector2.down, groundCheckY, whatIsGround)
            || Physics2D.Raycast(GroundCheckPoint.position + new Vector3(groundCheckX, 0, 0), Vector2.down, groundCheckY, whatIsGround)
            || Physics2D.Raycast(GroundCheckPoint.position + new Vector3(-groundCheckX, 0, 0), Vector2.down, groundCheckY, whatIsGround))
        {
            return true;
        }
        else
        {
            return false;
        }

    }

    void jump()
    {
        if(Input.GetButtonUp("Jump") && rb.linearVelocity.y > 0)
        {
            rb.linearVelocity = new Vector2(rb.linearVelocity.x, 0);  //permet dannuler le jump en pleine air
        }
        if(Input.GetButtonDown("Jump") && Grounded())
        {
            rb.linearVelocity = new Vector3(rb.linearVelocity.x, jumpForce);
        }
       
    }
}


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