Function find

src/butil/strings/string16.h:92–95

  }

  static const char_type* find(const char_type* s, size_t n,
                               const char_type& a) {
    return c16memchr(s, a, n);
  }

  static char_type* move(char_type* s1, const char_type* s2, int_type n) {
    return c16memmove(s1, s2, n);