tree

type Node[T comparable] interface {
	String() string          // String returns node self information
	Parent() T               // Parent returns parent node or nil
	NumChild() int           // NumChild returns number of child
	GetChildByIndex(i int) T // GetChildByIndex gets child by index
}

type NodeMarshaler[T comparable] interface {
	Node[T]
	Marshal() ([]byte, error)
}

type Options struct {
	Prefix     string
	Parent     string // default "│  "
	Space      string // default "   "
	Branch     string // default "├──"
	LastBranch string // default "└──"
}