How to call task.spawn() multiple times that doesn't print multiple words but return to the beginning?

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I was going to make combat system whenever player clicks. It plays different animations. What I want to do is when player stop clicking for a while. The animation resets to the beginning.

I have the issue on using thread or something whatever. Here’s an example:

-- This is just the only issue I'm talking about. If you need to see more code please tell me.

local runservice = game:GetService("RunService")
local returncombo

local hit_debounce = false
local hit = false

runservice.Heartbeat:Connect(function (deltaTime)
	
	if COMBO == 0 then full_combo = false already_hit = false end
	
	if COMBO == 1 or COMBO == 2 or COMBO == 3 then full_combo = false already_hit = true COMBO_DURATION = math.abs(LIGHTCOMBO_COOLDOWN - HIT_COOLDOWN) end
	
	if COMBO == 4 then COMBO_DURATION = math.abs(LIGHTCOMBO_LAST_COOLDOWN - HIT_COOLDOWN) full_combo = true SetReturnComboStartCooldown() task.wait(1) COMBO = 0 end
	
	if not hit_debounce and hit then
		hit_debounce = true

		task.cancel(returncombo) -- issues here
		
		returncombo = task.spawn(returnCombo) -- issues here
		
		
	end
	
end)

The thing is I know only few on how to use coroutine and task. I want an example that can make me understand.