docs: public static ItemStack getSmeltingRecipeForRequestedOutput(String output)
      {
          ItemStack target = MinecraftTypeHelper.getItemStackFromParameterString(output);
          Iterator<?> furnaceIt = FurnaceRecipes.instance().getSmeltingList().keySet().iterator();
          while (furnaceIt.hasNext())
          {
              ItemStack isInput = (ItemStack)furnaceIt.next();
              ItemStack isOutput = (ItemStack)FurnaceRecipes.instance().getSmeltingList().get(isInput);
              if (itemStackIngredientsMatch(target, isOutput))
                  return isInput;
          }
          return null;
      }