constexpr range manipulation functions
xieite::pad()
xieite::pad_back()
xieite::pad_front()
xieite::partial_reverse()
xieite::quote()
xieite::str_after()
xieite::str_after_last()
xieite::str_before()
xieite::str_before_last()
xieite::str_between()
xieite::str_join()
xieite::str_repeat()
xieite::str_replace()
xieite::str_split()
xieite::str_truncate()
xieite::substr()
xieite::tolower()
xieite::toupper()
xieite::trim()
xieite::trim_back()
xieite::trim_front()
xieite::unquote()
xieite::view_after()
xieite::view_before()
xieite::view_between()