Let's directly go to the example. I am writing a sentence

> 
> *Calling this function multiple times is unnecessary but harmless.*
> 
> 
> 

['Call a function' is idiomatic in say C/C++.]

I have a feeling that there could advantageously be an adverb placed at the end of this sentence to make it look more natural. But I am not sure whether it is

> 
> *Calling this function multiple times is unnecessary but harmless **either**.*
> 
> 
> 

or

> 
> *Calling this function for multiple times is unnecessary but harmless **as well**.*
> 
> 
> 

or something else.

Can someone please offer advice on this?