is it benefitted or benefited?

...It becomes ‘benefiting/benefited’, because there is usually no doubling when the preceding vowel is unstressed.
...

Source: english grammar and communication hints and tips

it would be so nice if all the tools i need are committed to memory, even better if everything is in my spellchecker already. but sometimes, i still get confused and a lot of times i have to double check just to be really really sure even if i already got it right.

that is why tips and tricks sites always comes in handy