(********************************************************************)
(*  OCaml code from the book ``Learn Programming with OCaml''       *)
(*  See https://usr.lmf.cnrs.fr/lpo/                                *)
(*                                                                  *)
(*  Sylvain Conchon and Jean-Christophe Filliâtre                   *)
(*  Copyright 2025 Université Paris-Saclay and CNRS                 *)
(*                                                                  *)
(*  Openly licensed via CC BY SA 4.0                                *)
(*  See https://creativecommons.org/licenses/by-sa/4.0/deed.en      *)
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(* Program 24 on page 182
   Generic String Signature *)

module type STRING = sig
  type t
  type char
  val length : t -> int
  val empty : t
  val make : int -> char -> t
  val get : t -> int -> char
  val append : t -> t -> t
  val sub : t -> int -> int -> t
end

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