Why wont these commands work?

It isn't killing the player. Not sure why....

There are not errors.

Full Script:

--// Ranks
local Owners = {'Player', 'Scriptecx'}
local Admins = {}
local Mods = {}
local Temps = {}
local TempBans = {}
local PBans = {}

--// Configuration Settings
CommandPrefix = 'c'
 NoobAge = 300

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--                                    DONT EDIT ANYTHING UNDER THIS LINE! UNLESS YOU KNOW WHAT YOU ARE DOING!
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

--// Services
local Players = game:GetService('Players')
local Lighting = game:GetService('Lighting')
local Debris = game:GetService('Debris')

function GetPlayers() return Players:GetPlayers() end

function CheckRank(player,rank)
    for _,v in pairs (rank) do 
        if tonumber(v) and v == player.userId then
            print ('User Accepted')
            return true 
        elseif tostring(v) and v == player.Name:lower() then 
            print ('User Accepted')
            return true
        else print ('Nop')
        end
    end
    return false 
end

function getPlayer (msg, speaker)
    local Got = {}
    if msg:sub(1,2) == "me" then return {speaker}
    elseif msg:sub(1,3) == "all" then 
        for _, v in pairs (GetPlayers()) do 
            table.insert (Got, v) 
        end
    elseif msg:sub(1,6) == "others" then 
        for _,v in pairs (GetPlayers()) do 
            if v ~= speaker then table.insert (Got, v) 
            end 
        end     
    elseif msg:sub (1,6) == "random" then 
        return {(Players[math.random (1, #Players:GetPlayers())])}
    elseif msg:sub(1,6) == "admins" then 
        for _,v in pairs (GetPlayers()) do 
            if CheckRank(v, Admins) == true or CheckRank(v, Temps) == true or CheckRank(v, Owners) == true or CheckRank(v, Mods) == true then 
                table.insert(Got, v) 
            end 
        end
    elseif msg:sub(1,6) == "nonadmins" then 
        for _,v in pairs (GetPlayers()) do 
            if CheckRank(v, Admins) == false or CheckRank(v, Temps) == false or CheckRank(v, Owners) == false or CheckRank(v, Mods) == false then table.insert(Got, v) 
            end 
        end
    elseif msg:sub(1,5) == "noobs" then  
        for _,v in pairs (GetPlayers()) do 
            if v.AccountAge <= NoobAge then 
                table.insert(Got, v) 
            end
        end
    elseif msg:sub(1,6) == "elders" then  
        for _,v in pairs (GetPlayers()) do 
            if v.AccountAge >= NoobAge then 
                table.insert(Got, v) 
            end 
        end
    else 
        for _, v in pairs (GetPlayers()) do 
            if string.find(string.lower(v.Name),string.lower(msg)) then 
                return {v} 
            end 
        end
    end 
    return Got
end

function chat(str, Speaker)
    local command = str:lower()
    if CheckRank(Speaker,Owners) then
        if command:sub (1, 4 + CommandPrefix:len()) == CommandPrefix.."kill" then
            local player = getPlayer(command:sub(4 + #CommandPrefix + 1), Speaker)
            if #player >= 1 then
                for _, p in pairs (player) do player.Character:BreakJoints() end
            end
        end
    end
end

Players.PlayerAdded:connect(function(plr)
    plr.Chatted:connect(function(str)
        chat(str, plr)
    end)
end)