subordinate clause

[rezaa]

when a subordinate clause functioning as an adjective complement do we have the optionality to put a linking prepostion?

for example:
1. I'm not sure what you did was right
1a. I'm not sure of what you did was right or not

[Buddhaheart]

1. I'm not sure what you did was right. T
1a. I'm not sure of what you did was right or not . X