"make a script that loop teleports my character behind of the nearest enemy and then loop teleports my character Infront of the nearest enemy"

-- local script 
local Players = game:GetService("Players")
local LocalPlayer = Players.LocalPlayer
local Character = LocalPlayer.Character
local HumanoidRootPart = Character:FindFirstChild("HumanoidRootPart")

while wait(1) do
    local closestEnemy = nil
    local shortestDistance = math.huge

for _, player in pairs(Players:GetPlayers()) do
        if player ~= LocalPlayer then
            local enemyCharacter = player.Character
            local enemyHumanoidRootPart = enemyCharacter and enemyCharacter:FindFirstChild("HumanoidRootPart")
            if enemyHumanoidRootPart then
                local distance = (HumanoidRootPart.Position - enemyHumanoidRootPart.Position).Magnitude
                if distance < shortestDistance then
                    shortestDistance = distance
                    closestEnemy = enemyHumanoidRootPart
                end
            end
        end
    end

if closestEnemy then
        -- teleport behind the enemy
        HumanoidRootPart.CFrame = CFrame.new(closestEnemy.Position + closestEnemy.CFrame.lookVector * -5, closestEnemy.Position)
        wait(1)
        -- teleport in front of the enemy
        HumanoidRootPart.CFrame = CFrame.new(closestEnemy.Position + closestEnemy.CFrame.lookVector * 5, closestEnemy.Position)
    end
end