how do you make a script builder run local scripts?

i have been wanting help on this for a long time im trying to create a script builder and cant seem to know how i can make it on my game so it can run local scripts --My Attempt

script.Parent.TextButton.MouseButton1Down:connect(function()
local codetoexecute = script.Parent.TextBox.Text
local scripttable = {}
local function runInSandbox(f)
    --get the old function environment
    local oldenv = getfenv(f)

    --create a new one
    local newenv = setmetatable({}, {
        __index = function(_, k)
            if k:lower() == 'game' or k:lower() == 'workspace' or k == 'Instance' then
                --that prevents any instances being accessed
                return nil
            else
                --but otherwise defaults to the old one
                return oldenv[k]
            end
        end
    })

    --call the function in its new environment
    setfenv(f, newenv)
    f()
end


local func,err = loadstring(codetoexecute)()
table.insert(scripttable,codetoexecute)


end)