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

Correction:

void youarethedumbass(unsigned int i) {
    while (--i) {
        youarethedumbass(i);
    }
}

Forgive me, I am badly drunk.