Check block name against array

print("Felling start")
function CheckFuel()
	if turtle.getFuelLevel() <= 100 then
  turtle.refuel(1)
  print ("Turtle refuelled by 1")
  print("Turtle fuel level: ", turtle.getFuelLevel())
	end
end
--[[function TurtleInspect(direction)
if direction == "down" then
  local Inspect, data = turtle.inspectDown()
end
end]]
function CheckGround()
local GroundPresent, data = turtle.inspectDown()
while not GroundPresent do
  GroundPresent, data = turtle.inspectDown()
  turtle.down()
end
end
function ObstacleTest()
if string.match(data.name, "log") then
  print("Tree found")
  CutTree()
end
if string.match(data.name, "leaves") then
  turtle.dig()
  do return end
end
local ObstacleUp, dataUp = turtle.inspectUp()
if ObstacleUp then
  if string.match(dataUp.name, "leaves") then
   turtle.digUp()
   do return end
  end
end
if string.match(data.name, "dirt") or string.match(data.name, "grass") or string.match(data.name, "stone") or string.match(data.name, "sand") then
  if not turtle.up() then
   turtle.digUp()
  end
  do return end
end
if not turtle.up() then
  turtle.dig()
end
end
function AvoidObstacle()
--local AvoidItems = {"dirt", "grass", "stone"}
ObstaclePresent, data = turtle.inspect()
while ObstaclePresent do
  CheckFuel()
  ObstacleTest()
  ObstaclePresent, data = turtle.inspect()
end
turtle.forward()
print("Obstacle avoided")
end
function CutTree()
CheckFuel()
turtle.dig()
turtle.forward()
local TreeDown, data = turtle.inspectDown()
local k = 0
while string.match(data.name, "log") do
  turtle.digDown()
  turtle.down()
  k = k+1
  TreeDown, data = turtle.inspectDown()
end
while k > 0 do
  turtle.up()
  k = k-1
end
local TreeUp, data = turtle.inspectUp()
while TreeUp do
  if string.match(data.name, "log") then
   turtle.digUp()
   turtle.up()
  else
   do break end
  end
  TreeUp, data = turtle.inspectUp()
end
CheckGround()
CheckFuel()
print("Tree cut down")
end
function ScanRow()
for i=1,50 do
  CheckFuel()
  CheckGround()
  local TreeDown, data = turtle.inspectDown()
  if TreeDown and string.match(data.name, "log") then
   print("Tree found")
   CutTree()
  end
  local detected, data = turtle.inspect()
  if detected then
   if string.match(data.name, "log") then
	print("Tree found")
	CutTree()
   else
	AvoidObstacle()
   end
  else
   turtle.forward()
  end
end
end
for j=1,50,2 do
CheckFuel()
ScanRow()
print("j = ", j)
turtle.turnRight()
turtle.forward()
turtle.turnRight()
CheckFuel()
ScanRow()
print("j = ", j+1)
turtle.turnLeft()
turtle.forward()
turtle.turnLeft()
end