Recursive Character Search and Destroy

I receive a string, and I want to remove any 'a', 'b' and 'c' characters, in a recursive way.

How do I do this in C and Java?

Thanks

doYourOwnHomework [] = []
doYourOwnHomework (x:xs) | x `notElem` "abc" = x:doYourOwnHomework xs
                         | otherwise = doYourOwnHomework xs