fix Makefile and README.md for 2020/endoh3

2020/endoh3/README.md

@@ -1,23 +1,42 @@
 # Most head-turning
 
+```
 Yusuke Endoh  
 Twitter: @mametter  
+```
 
+## To build:
 
-The code for this entry can be found in prog.c
+```sh
+make
+```
 
-## Judges' comments:
-### To use:
+### To run:
 
-    make
-    ./prog
+```sh
+./prog
+```
+
+### Alternate code:
+
+An alternate version of this entry, `prog.alt.c`, is provided.  This alternate code uses Unicode letters.
+
+To compile this alternate version:
+
+```sh
+make alt
+```
+
+Use `prog.alt` as you would `prog` above.
 
 ### Try:
 
-    ./run_clock
-    # And watch closely for 15-20 seconds
+```sh
+./run_clock
+# And watch closely for 15-20 seconds
+```
 
-### Selected Judges Remarks:
+## Judges' comments:
 
 You may be tempted to use a mirror. Resist the temptation! Try figuring out how the clock hands are drawn.
 Can you change the program to make it draw a familiar (non-mirrored) clock face? Can you add the second hand?
@@ -25,20 +44,19 @@ Can you change the program to make it draw a familiar (non-mirrored) clock face?
 When using the `run_clock` shell script, your perception of time might depend on what time it is.
 
 ## Author's comments:
+
 Prepare a mirror!
 
-    $ make clock
+```sh
+make clock
+```
 
 Note: You need to recompile it each run.
 
----
+## Copyright:
 
-prog.alt.c is an alternate version that uses Unicode letters, which was suggested by the judges.
-
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 (c) Copyright 1984-2020, [Leo Broukhis, Simon Cooper, Landon Curt Noll][judges] - All rights reserved
 This work is licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License][cc].
 
 [judges]: http://www.ioccc.org/judges.html
 [cc]: http://creativecommons.org/licenses/by-sa/3.0/
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