Curve player movement

how can I make my player curve w$$anonymous$$le walking in x wAsD <- AD test my script.. please lift me up..

 void Update()
     {
 
         float horizontalInput = Input.GetAxisRaw("Horizontal");
         float verticalInput = Input.GetAxisRaw("Vertical");
 
         Vector3 movementDirection = new Vector3(horizontalInput, 0, verticalInput);
         movementDirection.Normalize();
 
         if(movementDirection != Vector3.zero)
         {
 
             float targetRotation = Mathf.Atan2(horizontalInput, verticalInput) * Mathf.Rad2Deg + Camera.main.transform.eulerAngles.y;        
             transform.eulerAngles = Vector3.up * Mathf.SmoothDampAngle(transform.eulerAngles.y, targetRotation, ref turnSmoothVelocity, turnSmoothTime);
 
         }
 
         
 
         float targetSpeed = speed * movementDirection.magnitude;
         currentSpeed = Mathf.SmoothDamp(currentSpeed, targetSpeed, ref speedSmoothVelocity, speedSmoothTime);
         transform.Translate(transform.forward * currentSpeed * Time.deltaTime, Space.World);
 
         anim_Warrior(movementDirection);
         
     }