Smelting dropped item

hi, i'm making a simple minecraft mod. i want a pickaxe to autoSmelt on leftClick, but i can't figure out how to smelt the dropping item.

code:

public class darkPick extends ItemPickaxe

{

  Boolean isSmeltOn = false;

  public darkPick(ToolMaterial material)

  {

      super(material);

      this.setFull3D();

  }

  @Override

  public ItemStack onItemRightClick(ItemStack item, World world, EntityPlayer player)

  { 

      if(isSmeltOn == true){

        isSmeltOn = false;

      }

      if(isSmeltOn == false){

        isSmeltOn = true;

        //autoSmelting the items

      }

      return super.onItemRightClick(item, world, player);

  }

}