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

This is the correct way to do it iteratively in C:

//Null terminated strings 'str' and 'rem'
char *strrem(char *str, const char *rem) {
    char *ip, *sp, *rp;
   
    if (str && *str && rem && *rem) {
        for (ip = sp = str; *sp; ++sp) {
            for (rp = (char *) rem; *rp; ++rp) {
                if (*sp == *rp) {
                    break;
                }
            }
           
            if (!*rp) {
                *ip++ = *sp;
            }
        }
       
        while (*ip) {
            *ip++ = '\0';
        }
     }   
    
     return str;
}

I'll leave it to you to find the recursive version which isn't terribly difficult to find.