code: func extractClasses(s string) []string {
  	var classes []string
  
  	for i, token := range strings.Split(s, dot) {
  		if i == 0 {
  			continue
  		}
  
  		class := strings.Split(token, sharp)[0]
  
  		if class == "" {
  			continue
  		}
  
  		classes = append(classes, class)
  	}
  
  	return classes
  }
docs: // extractClasses extracts and returns classes.