Melon harvester

i=1
while true do
turtle.select(i)
if turtle.detect()==true then
turtle.dig()
end
if turtle.getItemSpace(i)==0 then
i=i+1
end
if turtle.getItemSpace(16)==0 then
for j = 1,16 do
turtle.select(j)
turtle.dropDown()
end
i=0
end
end