How do I find a player if I have his name with lowercase letters?

So I'm making a command bar, and for example, I have a kill command. The commands are seen from the textbutton.

My name is Player, and I have this text in the textbutton: kill player

What I want to do: -Check if there is a name "Player" in the game (with the text being 'player', not 'Player') -Kill the player if there is

What I've tried:

local textbox = script.Parent
local textbutton = script.Parent.ExecuteButton

local FindPlayer = function(plr)
	local newplrs = game:GetService('Players'):GetPlayers()
	for _,n in pairs(newplrs) do
		if (string.lower(plr) == string.lower(n)) then
			return true
		end
	end
end

Kill = function(text)
	if (string.sub(text,1,5) == 'kill ') then
		local trgPlayer	= FindPlayer(string.sub(text,6))
		if trgPlayer and trgPlayer.Character then
			trgPlayer.Character:BreakJoints()
		end
	end
end

textbutton.MouseButton1Down:connect(function()
	Kill()
end)

Any help would be appreciated.

With the player's name, use

string.lower()

on it, then when testing if the player is in game.Players use

string.lower()

on the objects in game.Players as well.