func IsJaeum(r rune) bool {
	switch {
	case G <= r && r <= H:
		return true
	case IsLead(r):
		return true
	case IsTail(r):
		return true
	}
	return false
}
IsJaeum checks given rune is Hangul Jaeum
package hangul
func IsLead(r rune) bool {
	if LeadG <= r && r <= LeadH {
		return true
	}
	return false
}
func IsMedial(r rune) bool {
	if MedialA <= r && r <= MedialI {
		return true
	}
	return false
}
func IsTail(r rune) bool {
	if TailG <= r && r <= TailH {
		return true
	}
	return false
}