fix improper use of whitespace in README.md files

The use of the markdown trailing whitespace to indicate
line break should NOT be done when the following line is empty.

This removes such improper use of whitespace in README.md files.

1996/huffman/README.md

@@ -6,7 +6,7 @@ Applied Innovation Inc
 Dublin, OH 43016  
 US  
 <http://www.huffmancoding.com>  
-huffmancoding@gmail.com  
+huffmancoding@gmail.com
 
 ## To build:
 
@@ -23,7 +23,7 @@ echo 'Huffman Decoding' | ./huffman
 NOTE: this program uses `gets()` so you will likely get a warning when compiling
 and/or running on modern systems.
 
-## Try: 
+## Try:
 
 ```sh
 echo 'seeing or feeling is believing' | ./huffman