func (t *Table) stringDash() string {
	s := "|"
	for i := 0; i < t.lineLength()-2; i++ {
		s += "-"
	}
	s += "|"
	return s
}
func (t *Table) stringDash() string {
	s := "|"
	for i := 0; i < t.lineLength()-2; i++ {
		s += "-"
	}
	s += "|"
	return s
}
// stringDash - output dash (on top and header).