"make a roblox script a leaderstats called Robux and each time a player dies they get - 1 but when a player kills another player the player who killed the other player will get 1"

-- script for player leaderstats 
local Players = game:GetService("Players")

local function onPlayerAdded(player)
    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = player

local Robux = Instance.new("IntValue")
    Robux.Name = "Robux"
    Robux.Value = 0
    Robux.Parent = leaderstats
end

Players.PlayerAdded:Connect(onPlayerAdded)

-- script for handling player death and kill 
local Players = game:GetService("Players")

local function onPlayerDied(player, killer)
    local deadPlayerStats = player.leaderstats
    local killerStats = killer.leaderstats

if deadPlayerStats and killerStats then
        deadPlayerStats.Robux.Value = deadPlayerStats.Robux.Value - 1
        killerStats.Robux.Value = killerStats.Robux.Value + 1
    end
end

local function onCharacterAdded(character)
    local humanoid = character:WaitForChild("Humanoid")
    humanoid.Died:Connect(function()
        local player = Players:GetPlayerFromCharacter(character)
        local killer = humanoid:GetKiller()
        if player and killer then
            onPlayerDied(player, killer)
        end
    end)
end

local function onPlayerAdded(player)
    player.CharacterAdded:Connect(onCharacterAdded)
end

Players.PlayerAdded:Connect(onPlayerAdded)