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.

2020/endoh1/README.md

@@ -2,7 +2,7 @@
 
 Yusuke Endoh
 <https://github.com/mame/>  
-Mastodon: [@mame@ruby.social](https://ruby.social/@mame)  
+Mastodon: [@mame@ruby.social](https://ruby.social/@mame)
 
 ## To build:
 

2020/endoh2/README.md

@@ -2,7 +2,7 @@
 
 Yusuke Endoh  
 <https://github.com/mame/>  
-Mastodon: [@mame@ruby.social](https://ruby.social/@mame)  
+Mastodon: [@mame@ruby.social](https://ruby.social/@mame)
 
 ## To build:
 

2020/endoh3/README.md

@@ -2,7 +2,7 @@
 
 Yusuke Endoh  
 <https://github.com/mame/>  
-Mastodon: [@mame@ruby.social](https://ruby.social/@mame)  
+Mastodon: [@mame@ruby.social](https://ruby.social/@mame)
 
 ## To build:
 

2020/ferguson1/README.md

@@ -3,7 +3,7 @@
 Cody Boone Ferguson <ioccc@xexyl.net>    
 <https://ioccc.xexyl.net>   
 <https://xexyl.net>  
-Mastodon: [@xexyl@fosstodon.org](https://fosstodon.org/@xexyl)    
+Mastodon: [@xexyl@fosstodon.org](https://fosstodon.org/@xexyl)
 
 ## To build:
 

2020/ferguson2/README.md

@@ -3,7 +3,7 @@
 Cody Boone Ferguson <ioccc@xexyl.net>    
 <https://ioccc.xexyl.net>   
 <https://xexyl.net>  
-Mastodon: [@xexyl@fosstodon.org](https://fosstodon.org/@xexyl)    
+Mastodon: [@xexyl@fosstodon.org](https://fosstodon.org/@xexyl)
 
 
 ## To build:
@@ -15,10 +15,10 @@ make
 ## To run:
 
 ```sh
-./prog  
+./prog
 
 # get recode help:
-./recode -h  
+./recode -h
 
 # general syntax for recode passing to Enigma machine:  
 ./recode [options] | ./prog - 2>/dev/null  
@@ -26,14 +26,14 @@ make
 ./recode [options]  
   
 # recode prompts for settings; pass to Enigma machine:  
-./recode | ./prog - 2>/dev/null   
+./recode | ./prog - 2>/dev/null
 
 # recode reads from input file, prompts for settings; pass to Enigma machine:  
-./recode -finput | ./prog - 2>/dev/null  
+./recode -finput | ./prog - 2>/dev/null
 
 # recode reads config from string or file; pass to Enigma machine after
 # prompting for input:
-./recode -R<string|file> | ./prog - 2>/dev/null  
+./recode -R<string|file> | ./prog - 2>/dev/null
 
 # write config to output file; pass to Enigma machine after prompting for input:  
 ./recode -o<config> | ./prog - 2>/dev/null  
@@ -42,7 +42,7 @@ make
 ./recode -r
   
 # show Enigma machine settings after selection / generation:    
-./recode -v  
+./recode -v
 
 ```
 
@@ -64,7 +64,7 @@ echo IOCCC | ./prog | ./prog
 echo testing test tests | ./recode  
 echo testing test tests | ./recode | ./prog - 2>/dev/null  
 echo testing test tests | ./recode | ./prog - 2>/dev/null | ./recode  
-echo testing test tests | ./recode | ./prog - 2>/dev/null | ./recode | ./prog - 2>/dev/null  
+echo testing test tests | ./recode | ./prog - 2>/dev/null | ./recode | ./prog - 2>/dev/null
 
 # even more obfuscated fun saving and reading from files:
 #
@@ -112,7 +112,7 @@ There is a good deal of useful documentation that is provided with this entry:
 
 * [chocolate-cake.html][] (or [chocolate-cake.md](chocolate-cake.md) if reading on GitHub)   
 	- Because most of us could use some *Double-layered Chocolate Fudge Cake*!  
-	- NOTE: see [recode.html][] (or [recode.md](recode.md) for details about how to decrypt this!  
+	- NOTE: see [recode.html][] (or [recode.md](recode.md) for details about how to decrypt this!
 
 
 [recode.html]: recode.html

2020/giles/README.md

@@ -1,7 +1,7 @@
 # Most phony
 
 Edward Giles  
-<https://id523a.com/>  
+<https://id523a.com/>
 
 ## To build:
 

2020/kurdyukov1/README.md

@@ -1,7 +1,7 @@
 # Best utility
 
 Ilya Kurdyukov  
-<https://github.com/ilyakurdyukov>  
+<https://github.com/ilyakurdyukov>
 
 ## To build:
 
@@ -27,7 +27,7 @@ echo IOCCC | ./prog
 
 ### Alternate code
 
-An even smaller alternate version of this entry, prog.alt.c, is provided.  This code does not contain any headers, nor any workaround for WIN32 based platforms.  
+An even smaller alternate version of this entry, prog.alt.c, is provided.  This code does not contain any headers, nor any workaround for WIN32 based platforms.
 
 To compile this alternate version:
 
@@ -71,7 +71,7 @@ Added a macro hack to make stdin work in binary mode under Windows (tested under
 
 ### Bonus
 
-- `prog.extra.c` the same with the sine function (so smaller), and in different shapes. 
+- `prog.extra.c` the same with the sine function (so smaller), and in different shapes.
 
 - `prog.x86_64.asm` contains same program, but written on assembly for x86_64 Linux, for the sake of less executable size. Which is 500 bytes long (where 120 is for ELF headers) after compilation. Algorithm details is slightly differ (like constants packing), just to make smaller binary code. It's interesting to compare density of binary code and obfuscated C.
 

2020/kurdyukov2/README.md

@@ -1,7 +1,7 @@
 # Least detailed
 
 Ilya Kurdyukov  
-<https://github.com/ilyakurdyukov>  
+<https://github.com/ilyakurdyukov>
 
 ## To build:
 

2020/kurdyukov3/README.md

@@ -1,7 +1,7 @@
 # Bset slaml prragom
 
 Ilya Kurdyukov  
-<https://github.com/ilyakurdyukov>  
+<https://github.com/ilyakurdyukov>
 
 ## To build:
 

2020/kurdyukov4/README.md

@@ -1,7 +1,7 @@
 # Best abuse of lámatyávë
 
 Ilya Kurdyukov  
-<https://github.com/ilyakurdyukov>  
+<https://github.com/ilyakurdyukov>
 
 ## To build:
 

2020/otterness/README.md

@@ -1,7 +1,7 @@
 # Most percussive
 
 Nathan Otterness  
-<https://github.com/yalue>  
+<https://github.com/yalue>
 
 ## To build:
 

2020/tsoj/README.md

@@ -1,7 +1,7 @@
 # Most misleading indentation
 
 tsoj <tsoj.tsoj@gmx.de>  
-<https://gitlab.com/tsoj>  
+<https://gitlab.com/tsoj>
 
 ## To build:
 

2020/yang/README.md

@@ -1,7 +1,7 @@
 # Best abuse of CPP
 
 Don Yang  
-<http://uguu.org/>  
+<http://uguu.org/>
 
 ## To build: