inspect

function Pick()

  local success, data = turtle.inspect()

  if success then
    print("Block name: ", data.name)
    if (tonumber(data.metadata) == 7) then
      turtle.dig()
    end
  end
end
function turnAround()
  local success, data = turtle.inspectDown()
  if success then
    if (data.name == "minecraft:ice") then
      turtle.turnLeft()
      turtle.turnLeft()
    end
  end
end
while (true) do
 turtle.forward()
 turnAround()
 turtle.turnLeft()
 Pick()
 turtle.turnRight()
 turtle.turnRight()
 Pick()
 turtle.turnLeft()
end