Help Doing This in a GUI / Creating this effect

[Sonostrano20 (InceptionStrange)]

In order to help people detect easily username of people in game i am asking how i can create a script like this?

As you can see “So” it’s the username i started write and “nostrano20” it should be what game suggest matching one of the people username in game.

My question is how can I create this effect?
So the script suggests the username based on the people in the game which can be autocompleted with Key Tab

if my request isn’t 100% clear just let me know and i will try to explain it better

I would really appreciate anyone’s help if they know how to accomplish this

[NyrionDev (Nyrion)]

--the function that determines if the keyword matches a username
local function match(keyword: string, user: string): boolean
	local part = user:sub(1, keyword:len())
	return part:lower() == keyword:lower()
end

local function find(keyword: string): {string}
	local results = {}
	--No need to make the search more sophisticated here
	--This is because the players amount is never computationally significant
	for _, player in pairs(game.Players:GetPlayers()) do
		if match(keyword, player.Name) then
			table.insert(results, player.Name)
		end
	end
	return results 
end

local function search(keyword: string): string?
	local results = find(keyword)
	if #results == 0 then return nil end
	return results[1]
end

--run this AFTER the player instance has loaded
local keyword = "so"
local result = search(keyword)
print(keyword, result)