fix standard headers and header spacing in winner README.md files

2020/endoh3/README.md

@@ -4,19 +4,22 @@ Yusuke Endoh\
 <https://github.com/mame/>\
 Mastodon: [@mame@ruby.social](https://ruby.social/@mame)
 
+
 ## To build:
 
 ```sh
 make
 ```
 
+
 ## To use:
 
 ```sh
 ./prog
 ```
 
-## Try:
+
+### Try:
 
 ```sh
 ./run_clock
@@ -35,6 +38,7 @@ make alt
 
 Use `prog.alt` as you would `prog` above.
 
+
 ## Judges' remarks:
 
 You may be tempted to use a mirror. Resist the temptation! Try figuring out how the clock hands are drawn.
@@ -42,6 +46,7 @@ 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 remarks:
 
 Prepare a mirror!
@@ -52,6 +57,7 @@ make clock
 
 Note: You need to recompile it each run.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.