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

If C isn't sandcore enough, here's some brainfuck.
,+[->+>++++++++[<++++++++++++>-]>[-]>[-]>[-]
<<<<[>+>+<<-]<[>+>>>+>+<<<<<-]>[>-<-]>[<<+>>[-]]+>+[<+<+>>-]
>[<+>>>+<<-]>>[<<+>>-]<<<[<<->>-]<<[<+>[-]]>[>>-<<-]
>>[<<<<+>>>>[-]]<<<<[-[-[>>>>>.<<<<<[-]][-]][-]],+]