not working

local col = 1
local loc = 1

function go()
while not turtle.forward()
turtle.dig()
turtle.attack
sleep(.5)
turtle.forward()
vDig()
end
end

function fuel()
while true do
if turtle.getFuelLevel() < 50 then
print("current fuel is " ..turtle.getFuelLevel().. " need 50+")
print("Please insert fuel source in slot 1")
turtle.select(1)
turtle.refuel()
break
else
print(" We currently have " ..turtle.getFuelLevel().. " good to go!")
sleep(2)
break
end
end
end

function clear()
term.clear()
term.setCursorPos(1,1)
end

function yCount()
turtle.digUp()
turtle.up()
loc = loc+1
print(loc)
end

function vDig()
   if turtle.detectUp() then
      repeat
      yCount()
      until turtle.detectUp() == false
      for i=1, loc do
      turtle.down()
      end
      end
      end


  function forward()
     for i=1, x do
     go()
     end
  end

  function leftDig()
  forward()
  turtle.turnLeft()
  turtle.dig()
  turtle.forward()
  vDig()
  turtle.turnLeft()
  rightDig()
  end

  function rightDig()
  forward()
  turtle.turnRight()
  turtle.dig()
  turtle.forward()
  vDig()
  turtle.turnRight()
  leftDig()
  end


  term.write("How many blocks forward? ")
  x = tonumber(io.read())
     clear()

 while true do
  print("Do you want the turtle to turn")
  print("Right or Left? R/L ")
  local event, param1 = os.pullEvent ("char")
  if param1 == "l" then
   print(" You chose Left! ")
   direction = "Left"

   sleep(2)
   break

  elseif param1 == "r" then
   print("You chose Right! ")
   direction = "Right"
   sleep(2)
   break
  else
   print ("Not valid!")
     sleep(1.5)
    clear()
   end
   end

clear()

   print("How many blocks to the " ..direction)
   print("do you want to go? ")
     y = tonumber(io.read())



     clear()
     print("Checking fuel...")
     sleep(2)
     fuel()
     sleep(2)


     if direction == "Left" then
     print("Starting!")
       for i=1, y do
       leftDig()
       rightDig()
      end
     else
     print("Starting!")
       for i=1, y do
       rightDig()
       leftDig()
       end
     end