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aoc-racket/2017/helper.rkt

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Racket

#lang br
(require syntax/strip-context sugar/list)
(provide (all-defined-out) (all-from-out syntax/strip-context sugar/list))
(define ') (define ★★ '★★)
(define (port->datums port)
(for/list ([datum (in-port read port)])
datum))
(define (number->digits num)
(for/list ([c (in-string (number->string num))])
(string->number (string c))))