My camera bobbing script won’t work and I need some help fixing it, can anyone help me?

Currently making a horror game where you explore, it’s locked in first person and every script I find doesn’t work, can anyone help me? I’d like it so when you walk the camera bobs and when you look around. The walk speed is 8 if you need it for the code. Thanks. The script I currently have is this

wait(0.1)
02  local cam = game.Workspace.CurrentCamera
03  local player = game.Players.LocalPlayer
04  local char = player.Character
05  local rs = game:GetService("RunService")
06  local lastTick = tick()
07  local t = 0
08  local headPos = char.Torso.Neck.C0
09  local running = false
10   
11  char.Humanoid.Running:connect(function(speed)
12          running = speed > 0
13  end)
14   
15  while true do
16      rs.RenderStepped:wait()
17      local dt = tick()-lastTick
18      if running then
19          t = t+dt
20   
21          char.Torso.Neck.C0 = headPos * CFrame.new(math.cos(t*8)*0.1, 0, math.abs(math.sin(t*8))*0.1)
22          local look = cam.CoordinateFrame.lookVector
23          cam.CoordinateFrame = CFrame.new(cam.CoordinateFrame.p, cam.CoordinateFrame.p+look) * CFrame.Angles(0, 0, math.rad(math.cos(t*8)))
24      end
25      lastTick = tick()
26  end