code: func classify(desired []cfclient.IsolationSegment, current []cfclient.IsolationSegment) classification {
  	currentSegments := make(map[string]*cfclient.IsolationSegment)
  	for i := range current {
  		currentSegments[current[i].Name] = &current[i]
  	}
  	desiredSegments := make(map[string]*cfclient.IsolationSegment)
  	for i := range desired {
  		desiredSegments[desired[i].Name] = &desired[i]
  	}
  
  	var missing []cfclient.IsolationSegment
  	for name, seg := range desiredSegments {
  		if _, ok := currentSegments[name]; !ok {
  			missing = append(missing, *seg)
  		}
  	}
  
  	var extra []cfclient.IsolationSegment
  	for name, seg := range currentSegments {
  		if _, ok := desiredSegments[name]; !ok {
  			extra = append(extra, *seg)
  		}
  	}
  
  	return classification{missing, extra}
  }
docs: // classify accepts a list of segments that should meet some property and a list
  // of segments that currently do meet that property, and returns a classification.