code: public static Collection<String> getChannelNames(
  			Collection<Channel> channels) {
  		Collection<String> channelNames = new HashSet<String>();
  		for (Channel channel : channels) {
  			channelNames.add(channel.getName());
  		}
  		return channelNames;
  	}
docs: Returns all the channel Names in the given Collection of channels
  
  @param channels - list of channels
  @return a set of all the unique names associated with the each channel in
  channels