I need help on Lisp programming.

Create a Lisp Recursive function FILTERTYPE that takes a type name and a list as parameters. It should return the list with all items of that type removed. Do error checking on the input.

Is there way to write the function using car, cdr, cons, cond?

Here's the sample inputs and outputs

[67]> (filtertype 'number '(a 2 (3 4) b))

(a (3 4) b)

[72]> (filtertype 'nil '(a () (b c) nil))

(a (b c))

[73]> (filtertype 'blah '(a b c))

Error in FILTERTYPE function. First argument must be a valid type name.