#MyHuffman# How to use?
first: enter your choice 1 represent compress a file, 2 represent uncompress a file .
second: enter your input file, like "/Users/mac/Downloads/Huffman-master/1.txt".
third: enter your output file, like "/Users/mac/Downloads/Huffman-master/hufmanFile1".
then we'll get a compressed file "hufmanFile1"