TRIM + IF Formula

I am trying to make a simple quiz on a spreadsheet which will provide the score immediately the player has finished. Basically a row is as follows:

C5= Question; D5 = player's input answer, E5 = check answer and give score

For example:
in C5 "What colour is a banana?"
The player inputs the answer to D5: yellow
in E5, the answer is tested by a formula and score is given. For this I have a formula IF(D5="yellow",1,0) hence E5 returns either 1 or 0.

Now my problem: If the player inputs one or more spaces, I need to use the TRIM function as well otherwise the answer will be incorrect. How can I work the TRIM with the IF formula?

A thought has just occurred to me that I might have to firstly Copy and TRIM the answer in to E5 and then have the IF condition in F5, but that needs another column and seems a longer way around.