Mine 3

local tArgs = { ... }
local x1
local y1
local z1

function printUsage()
    print("<Nom_du_programme> x,y,z")
end

function deplcacement(i,step,di)
    while i ~= di do
        turtle.forward()
        i = i + step
    end
end


    if #tArgs <= 2 then
        printUsage()
        return
    else

    xcord = tonumber(tArgs[1])
    ycord = tonumber(tArgs[2])
    zcord = tonumber(tArgs[3])

     x,y,z = gps.locate()

 local home = vector.new(xcord, ycord, zcord)
 local position = vector.new(gps.locate(5))
 local displacement = position - home

  print("I am ", tostring(displacement), " away from home!!!")

  t = {}
  for i in string.gmatch(tostring(displacement),"([^,]+)") do
    table.insert(t,i)
  end

   x1 = t[1]
   y1 = t[2]
   z1 = t[3]


  if tonumber(z1) < 0 then
    turtle.turnLeft()
    turtle.turnLeft()
    deplcacement(0,-1,z1)
    else
    deplcacement(1,1,z1)
  end


  if tonumber(x1) < 0 then
    turtle.turnRight()
    deplcacement(0,-1,x1)
    else
    turtle.turnLeft()
    deplcacement(1,1,x1)
  end



  --x1,y1,z1 = position - home
  --print(x1..y1..z1)
  --turtle.forward(z1)
end