How do I make my character smoothly decrease its speed when i stop pressing the movement buttons

[vandim]

So I am trying to make my character not suddenly stop when I release the arrow keys.
Just like in a mario game where when you stop running, mario slides a little bit.

Vector3 movement;
 void FixedUpdate()
        {
            float h = Input.GetAxisRaw ("Horizontal");
            float v = Input.GetAxisRaw("Vertical");
            
            Move (h, v);
        }
    void Move (float h, float v)
        {
            movement.Set(h, 0f, v);
            movement = movement.normalized * speed * Time.deltaTime;
            rb.MovePosition(transform.position + movement);
        }

[Hellium]

float horizontal ;
float vertical ;
void FixedUpdate()
{
float h = Input.GetAxisRaw (“Horizontal”);
float v = Input.GetAxisRaw(“Vertical”);

         if( Mathf.Abs( h ) > 0.001f )
             horizontal = h ;
         
         if( Mathf.Abs( v ) > 0.001f )
             vertical = v ;
         
         horizontal = Mathf.Lerp( horizontal, 0, Time.fixedDeltaTime ) ;
         vertical = Mathf.Lerp( vertical, 0, Time.fixedDeltaTime ) ;
         
         Move (horizontal, vertical);
     }