Can't make the programm find 4 items

[Caroling]

Thank you guys for your promt answers. Here is the code I ended up with

Code:

extern void object::Transmutation()
{
    object [] list;
    object alchemist;
    list = radarall (TitaniumOre);
    message ("Found " + sizeof(list) + " piece(s) of titanium ore");
    
    for(int i=0; i<sizeof(list); i++)
    {
          object item = list[i];
          goto(item.position);
          grab();
        
          alchemist = radar(Converter);
          goto(alchemist.position);
          drop ();
          move (-2.5);
          wait (8);
          
        while (alchemist.busy ())
        {
            wait (1);
        }
           move (2.5);
           grab ();
           goto (space());
           drop ();
    }
    message ("The task is completed");
}

But I have yet another question .
I have a task to find a black box. So, is there any way to check whether it is possible for a bot to get to the box and return back to the base?
Here is code I wrote.

Code:

extern void object::New()
{
    if (this.energyCell.energyLevel == 1)
    {
        object questitem;
        object home;
        questitem = radar (BlackBox);
        home = radar (SpaceShip);
        goto (questitem.position);
        grab ();
        goto (home.position);
        drop ();
    }
    else {
        message ("I can't");
    }
}

My solution is to check energy level of the bot. If it is fully charged then the bot flies there. It works well on this level, but it is not perfect.