How to strip off characters using strings?

I'm doing a pig latin code, and I am only to use strcmp, strcat, strcpy, and strlen and loops to accomplish it. I'm stuck on how to identify if the first two letters of the word is a blend (like st, ch, sh, etc.).

I know I need to somehow strip off those two letters, do a strcmp in an if statement, and then move them to the back of the word with a strcat.
I don't understand how to strip off the first two letters though and put them into a variable called 'twoletters', which I have set up.

if not answers, any hints?
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