Character Controller script for Unity 3D Game

//Start of Movement script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Movement : MonoBehaviour
{
    [SerializeField] bool grounded = false;
    [SerializeField] CharacterController controller;
    [SerializeField] float speed = 10f;//ground speed
    [SerializeField] float jHeight = 1.5f;//jump height
    [SerializeField] Vector3 crouch = new Vector3(1f, 0.5f, 1f);
    [SerializeField] float crspd = 4.5f;
    [SerializeField] float sia = 5.7325f;//speed in air
    float ground_dist;
    float x, y, z;
    Vector3 velocity;
    [SerializeField] float gravity = -9.81f;
    // Update is called once per frame
    void Update()
    {
        if(grounded && velocity.y<0)
        {
            velocity.y = 0;
        }
        x = Input.GetAxis("Horizontal");
        y = Input.GetAxis("Jump");
        z = Input.GetAxis("Vertical");
        ground_dist = 1f + 0.08f;
        if (Physics.Raycast(transform.position, -transform.up, out _, ground_dist))
        {
            grounded = true;
        }
        else
        {
            grounded = false;
        }
        Vector3 move = transform.right * x + transform.forward * z;
        if(Input.GetKey(KeyCode.LeftControl) && z==1f && grounded)//Sprint
        {
            controller.Move(speed * 1.5f * Time.deltaTime * move);
        }
        if(grounded)
        {
            controller.Move(speed * Time.deltaTime * move);
        }
        if(!grounded)
        {
            controller.Move(sia * Time.deltaTime * move);
        }
        if (y==1f && grounded)
        {
            velocity.y = Mathf.Sqrt(jHeight * -2f * gravity);
        }
        velocity.y += gravity * Time.deltaTime;
        controller.Move(velocity * Time.deltaTime);
    }
}
//End of movement script

//Start of vision script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Vision : MonoBehaviour
{
    [SerializeField] private float sens = 100f;
    [SerializeField] Transform player;
    float xrotation = 0f;
    // Start is called before the first frame update
    void Start()
    {
        Cursor.lockState = CursorLockMode.Locked;
    }

    // Update is called once per frame
    void Update()
    {
        float x = Input.GetAxis("Mouse X") * sens * Time.deltaTime;
        float y = Input.GetAxis("Mouse Y") * sens * Time.deltaTime;
        xrotation -= y;
        xrotation = Mathf.Clamp(xrotation, -90f, 90f);
        transform.localRotation = Quaternion.Euler(xrotation, 0f, 0f);
        player.Rotate(Vector3.up * x);
    }
}
//End of vision code