Scheme: How to convert a charlist to a string

I am stumped. I am trying to convert a charlist back to a string but it keeps failing: Its stupid because when I paste the result from one function into another it works just fine, but if I do it inside the function it fails...

Example: this works

(delete" h ell o ") outputs: '(#\h #\e #\l #\l #\o) (convertToString '(#\h #\e #\l #\l #\o)) outputs: "hello"

but this doesnt work, if the conertToString is called in delete this happens

(delete" hell o") outputs:. . list->string: contract violation expected: (listof char?) given: '(#\l . "o")

    (define deleteCh;driver
 (lambda (s)
(delete(string->list s))))

(define delete
 (lambda (input)
(cond
  [(null? input) input]
  [(equal? (car input) #\space)  (delete(cdr input))]
  [else (convertToString (cons (car input) (delete(cdr input))))];this works without convertToString 
  )
)
)
define convertToString
(lambda (charList)
(list->string charList)))