Clean_Wall

function checkFuel()
  if turtle.getFuelLevel() < 100 then
    turtle.select(1)
    turtle.refuel()
    trutle.select(2)
  end
end

print("Type Wall Size...")
local wallsize = tonumber(read())
checkFuel()
local i = 1
local j = 1
while i <= 4 do
  j = 1
  while j <= wallsize-1 do
    turtle.dig()
    turtle.forward()
    j = j + 1
    checkFuel()
  end
  i = i + 1
  turtle.turnLeft()
end