call same script on different objects

I have three spheres: sphereA, sphereB, sphereC; all of them share the same scriptA. then i have a square with scriptB attached.
When the square collides sphereA it returns the name "sphereA", if it collides sphereB, is "sphereB" and so on.
but i want you guys to tell me if my code will give problems or if there is an easier method, because it works fine.

scriptB

    public string myname;
     
     void OnTriggerEnter(collider oncoll)
     {
          if(oncoll.gameobject.tag == "square")
           { 
               myname = gameobject.name;
           }
      }
 
  void OnTriggerExit(collider offcoll)
     {
          if(offcoll.gameobject.tag == "square")
           { 
               myname = null;
           }
      }

scriptA (the only problem is that it doesnt return null when there is no name on scriptB)

 public scriptB[] scriptInfo;
 public string[] sphereNames = {"sphereA","sphereB","sphereC"}
 public string actualSphereName;

 void Start()
 {
     scriptInfo = FindObjectsOfType<scriptB>();
 }

 for(int scriptsthere = 0; scriptsthere < scriptInfo.Length; scriptsthere++)
         {
            for(int names = 0; names< sphereNames.Length; names++)
             {
                 if(scriptInfo[scriptsthere].myname == sphereNames[names])
                 {
                     switch (scriptsthere)
                     {
                         case 0:
                             actualSphereName = scriptInfo[scriptsthere].myname;
                             Debug.Log("test1");
                             break;
                         case 1:
                              actualSphereName = scriptInfo[scriptsthere].myname;
                             Debug.Log("test2");
                             break;
                         case 2:
                              actualSphereName = scriptInfo[scriptsthere].myname;
                             Debug.Log("test3");
                             break;
                         default:
                             actualSphereName = null;
                             break;
                         
                     }
                 }
             }
         }

if there is any easier or safest method i would be happy to know.