How can I disable messages with a "/" in them from showing?

I'm making admin commands and don't want them showing in chat, I have modified the "message sender" script but it doesn't work.

Edits on line 15 - 20

--	// FileName: MessageSender.lua
--	// Written by: Xsitsu
--	// Description: Module to centralize sending message functionality.

local module = {}
--////////////////////////////// Include
--//////////////////////////////////////
local modulesFolder = script.Parent

--////////////////////////////// Methods
--//////////////////////////////////////
local methods = {}
methods.__index = methods

function methods:SendMessage(message, toChannel)
	local prefix = "/"
	local splitString = message:split(prefix)
	if splitString[1] == prefix then
		else
	
	self.SayMessageRequest:FireServer(message, toChannel)
	end
end

function methods:RegisterSayMessageFunction(func)
	self.SayMessageRequest = func
end

--///////////////////////// Constructors
--//////////////////////////////////////

function module.new()
	local obj = setmetatable({}, methods)
	obj.SayMessageRequest = nil

	return obj
end

return module.new()

Thanks!

You can try forking the chat system for deleting messages like that (or don't fork and just modify and keep update functionality, not sure if u can have deletion of messages without forking though.), i recommend this article. https://developer.roblox.com/en-us/articles/Lua-Chat-System