Turtle quarry

xCoord = -178
yCoord = 81
zCoord = 157

zDiff = {-1, 0, 1, 0}
xDiff = {0, 1, 0, -1}
orientation = 4
orientations = {"north", "east", "south", "west"}

function left()
  orientation = orientation - 1
 orientation = (orientation - 1) % 4
 orientation = orientation + 1
 turtle.turnLeft()
end

function right()

 orientation = - 1
 orientation = (orientation + 1) % 4
 orientation = orientation + 1
 turtle.turnRight()
end

function moveForward()

  xCoord = xCoord + xDiff[orientation]
  zCoord = zCoord + zDiff[orientation]
  turtle.dig()
 moved = false
 while not(moved) do
 moved = turtle.forward()
 moved = print("I Tried to move")
end
  print("I moved :D")
end
function.moveUp()
   yCoord = yCoord + 1
   turtle.digUp()
   moved = false
 while not(moved) do
 moved = turtle.up()
 end
end
function moveDown()
  yCoord = yCoord - 1
  turtle.digDown()
 moved = false
 while not(moved) do
 turtle.down()
  end
end
function look(direction)
  while direction ~=orientations[orientation] do
  right()
  end
end
function goto(xTarget, zTarget, yTarget)
  while yTarget < yCoord do
  moveDown()
end
 while yTarget > yCoord do
 moveUp()
  end
end
if xTarget < xCoord then
look("west")
while xTarget > xCoord do
  moveForward()
end
end
if zTarget < zCoord then
  look("north")
while zTarget < zCoord do
  moveForward()
  end
end
if zTarget > zCoord then
  look("south")
while zTarget > zCoord do
moveForward()
  end
end