# unimplemented functions:
* func Clone(s string) string
* func EqualFold(s, t string) bool
* func FieldsFuncSeq(s string, f func(rune) bool) iter.Seq[string]
* func FieldsSeq(s string) iter.Seq[string]
* func Lines(s string) iter.Seq[string]
* func Map(mapping func(rune) rune, s string) string
* func SplitAfterSeq(s, sep string) iter.Seq[string]
* func SplitSeq(s, sep string) iter.Seq[string]
* func Title(s string) stringdeprecated
* func ToLowerSpecial(c unicode.SpecialCase, s string) string
* func ToTitle(s string) string
* func ToTitleSpecial(c unicode.SpecialCase, s string) string
* func ToUpperSpecial(c unicode.SpecialCase, s string) string
* func ToValidUTF8(s, replacement string) string