实现简单的压缩解压缩功能！具体实现是使用霍夫曼编码原理，外加数据结构的算法，通过建立霍夫曼树，进而遍历该树，将编码简短或者恢复-Realize simple compression decompression function! Concrete realization of the principle is the use of Huffman code, plus data structure algorithms, through the establishment of Huffman