liquidity-pool-v7

(define-data-var total-liquidity uint u0)

(define-map user-liquidity
  principal
  uint
)

(define-public (add-liquidity (amount uint))
  (begin
    (asserts! (> amount u0) (err u1))
    (map-set user-liquidity tx-sender amount)
    (var-set total-liquidity (+ (var-get total-liquidity) amount))
    (ok true)
  )
)

(define-read-only (get-user-liquidity (user principal))
  (ok (default-to u0 (map-get? user-liquidity user)))
)

(define-read-only (get-total-liquidity)
  (ok (var-get total-liquidity))
)