code: func FindSet(forests *Forests, name string) *DisjointSet {
  	forests.mu.Lock()
  	defer forests.mu.Unlock()
  	for data := range forests.data {
  		if data.represent == name {
  			return data
  		}
  		for k := range data.members {
  			if k == name {
  				return data
  			}
  		}
  	}
  	return nil
  }
docs: // FindSet returns the DisjointSet with the represent name.