Text file compression using huffman compression?

Hi I have used existing code for text file compression using huffman encoding. Here i have mentioned below from where i have used https://in.mathworks.com/matlabcentral/fileexchange/7725-huffman-coding-and-decoding-for-text-compression

After executing the above matlab file it executes properly but the compression file can't be shown. Here the paper4.txt file is used for compression. But after compression it won't show compressed file.

So any one help me in this regards.