✅ Can't stop multi jumping, Please Help

public LayerMask groundLayer; private bool isGrounded; public Transform feetPosition; public float groundCheckCircle; public float jumpTime = 0.35f; public float jumpTimeCounter; private bool isJumping; // Start is called before the first frame update void Start() {
} // Update is called once per frame void Update() { input = Input.GetAxisRaw("Horizontal"); if (input < 0) { spriteRenderer.flipX = true; } else if (input > 0) { spriteRenderer.flipX = false; } isGrounded = Physics2D.OverlapCircle(feetPosition.position, groundCheckCircle, groundLayer); if (isGrounded == true && Input.GetButtonDown("Jump")) { jumpTimeCounter = jumpTime; playerRb.velocity = Vector2.up * jumpForce; } isJumping = true; if (Input.GetButton ("Jump") && isJumping == true) { if(jumpTimeCounter > 0) { playerRb.velocity = Vector2.up * jumpForce; jumpTimeCounter -= Time.deltaTime; } else { isJumping = false; } } if (Input.GetButtonUp("Jump")) { isJumping = false; }