aaaaaaaaaaaaaaaaaaaaaWhy my script won't work?

I want make kill for money script but it don't give me money if I kill someone Here is script:

function onPlayerEntered(newPlayer)
local stats = Instance.new ("IntValue")
stats.Name = "leaderstats"
stats.Parent = newPlayer
local Money = Instance.new ("IntValue")
Money.Name = "Money"
Money.Value = 0
Money.Parent = newPlayer.leaderstats
end

function handleKillCount(humanoid, player)
 local killer = getKillerOfHumanoidIfStillInGame(humanoid)
 if killer ~= nil then
  local stats = killer:findFirstChild("leaderstats")
  if stats ~= nil then
   local kills = stats:findFirstChild("Money")
   if killer ~= player then
    kills.Value = kills.Value + 10
    
   else
    kills.Value = kills.Value - 1
    
			end
		end
	end
end

game.Players.ChildAdded:connect(onPlayerEntered)

You never call the function "handleKillCount"