format/format.go
func isPrintableString(str string) bool {
	for _, runeValue := range str {
		if !strconv.IsPrint(runeValue) {
			return false
		}
	}
	return true
}
func isPrintableString(str string) bool {
	for _, runeValue := range str {
		if !strconv.IsPrint(runeValue) {
			return false
		}
	}
	return true
}
/*
Returns true when the string is entirely made of printable runes, false otherwise.
*/