public interface IPathTransformer
    {
        String Transform(String path);
    }

    public class MovePathTransformer : IPathTransformer
    {
        private readonly String _targetDirectory;

        public MovePathTransformer(String targetDirectory)
        {
            if (targetDirectory == null) throw new ArgumentNullException("targetDirectory");
            _targetDirectory = targetDirectory;
            if (!_targetDirectory.EndsWith(@"\"))
                _targetDirectory += @"\";
        }

        public String Transform(String path)
        {
            if (path == null) throw new ArgumentNullException("path");
            return Path.Combine(_targetDirectory, Path.GetFileName(path));
        }
    }

    public class FileNameAppendPathTransformer : IPathTransformer
    {
        private readonly String _value;

        public FileNameAppendPathTransformer(String value)
        {
            if (value == null) throw new ArgumentNullException("value");
            _value = value;
        }

        public String Transform(String path)
        {
            if (path == null) throw new ArgumentNullException("path");
            String directory = Path.GetDirectoryName(path);
            String name = Path.GetFileNameWithoutExtension(path);
            String extension = Path.GetExtension(path);

            return Path.Combine(directory, String.Concat(name, _value, extension));
        }
    }

    public class TodayDatePathTransformer : IPathTransformer
    {
        private readonly String _dateFormat;

        public TodayDatePathTransformer()
            : this(@"MMddyyyy")
        {
        }

        public TodayDatePathTransformer(String dateFormat)
        {
            if (dateFormat == null) throw new ArgumentNullException("dateFormat");
            _dateFormat = dateFormat;
        }

        public String Transform(String path)
        {
            if (path == null) throw new ArgumentNullException("path");

            IPathTransformer appender = new FileNameAppendPathTransformer(DateTime.Today.ToString(_dateFormat));
            return appender.Transform(path);
        }
    }

    public class PathTransformer : IPathTransformer
    {
        private readonly IEnumerable<IPathTransformer> _transformers;

        public PathTransformer(params IPathTransformer[] transformers)
        {
            if (transformers == null) throw new ArgumentNullException("transformers");
            _transformers = transformers;
        }

        public String Transform(String path)
        {
            if (path == null) throw new ArgumentNullException("path");
            return _transformers.Aggregate(path, (current, transformer) => transformer.Transform(current));
        }
    }