billboard-v7

(define-data-var current-message (string-ascii 256) "")

(define-public (post-message (msg (string-ascii 256)))
  (begin
    (asserts! (> (len msg) u0) (err u1))
    (var-set current-message msg)
    (ok true)
  )
)

(define-read-only (get-message)
  (ok (var-get current-message))
)