strings.HasPrefix(s string, prefix string) -> bool
strings.HasSuffix(s string, suffix string) -> bool
strings.Index(s string, str string) -> int
strings.LastIndex(s string, str string) -> int
strings.Replace(str string, old string, new string, n int)
strings.Count(str string, substr string) -> int
strings.Repeat(str string, count int) -> string
strings.ToLower(str string) -> string
string.ToUpper(str string) -> string
strings.TrimSpace(str string)
strings.Trim(str string, cut string)
strings.TrimLeft(str string, cut string)
strings.TrimRight(str string, cut string)
strings.Field(str string)
