Unexpected symbol `public' in class, struct, or interface member declaration

I kinda new to unity programming and I have no idea what's the problem ( I am trying to create a script that makes a platform move when the player steps on it and then return to it's original position when the player leaves it)

 public class Moving_Platform_Script_2 : MonoBehaviour {
     public Transform position1;
     public Transform position2;
     public float speed= 15f;
     protected bool Switch = false;
     protected bool start=false;
     protected bool dummy=
     public GameObject player;
     public GameObject platform;
     
     
     void FixedUpdate(){
     if (start == true) {
                         if (transform.position == position2.position) {
                                 Switch = true;
                         }
         
                         if (transform.position == position1.position) {
                                 Switch = false;
                         }
                     
                 }
 
         if (start == false) {
             transform.position = Vector3.MoveTowards (transform.position, position1.position, speed * Time.deltaTime);
 
         //    platform.transform.position(52.94994f,17.94283f,36.07398f);
                 }
 
         
     }
     void OnTriggerEnter (Collider other){
 
         if (other.tag == "Player") {
                                 start = true;
             StartCoroutine( platformoperator() );
         }
         }
 
     IEnumerator platformoperator(){
 
         while (start==true){
         if (Switch==true) {
             transform.position = Vector3.MoveTowards (transform.position, position1.position, speed * Time.deltaTime);
         //    player.transform.position=Vector3.MoveTowards(transform.position, position1.position, speed*Time.deltaTime);
         }
         else {
             transform.position = Vector3.MoveTowards (transform.position, position2.position, speed * Time.deltaTime);
     //        player.transform.position=Vector3.MoveTowards(transform.position, position2.position, speed*Time.deltaTime);
     
             yield return null;    
             }
         }
         
         
     }
 }    

any help would be appreciated