include "String.aes"
contract StringX =
  entrypoint test() =
    let s1 = "a string"
    let s2 = "another string"
    let s  = String.concat(s1, s2)
    String.sha256(s)
    String.length(s1)
    String.from_list(String.to_list(s))
    String.split(4, s1)
    String.at(2, s2)
    String.tokens(s, ",")
    String.to_upper(s1)
    String.to_lower(s2)