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

1988/spinellis/README.md

@@ -5,13 +5,15 @@ GR\
 <https://www.spinellis.gr/>\
 Mastodon: <https://mstdn.social/@DSpinellis>
 
+
 ## To build:
 
 ```sh
 make all
 ```
 
-## Try:
+
+### Try:
 
 ```sh
 rm -f spinellis ; cc spinellis.c -o spinellis < input.txt && ./spinellis
@@ -37,6 +39,7 @@ and try:
 cc spinellis.alt.c -o spinellis.alt < input2.txt && ./spinellis.alt
 ```
 
+
 ## Judges' remarks:
 
 We enjoyed this entry this year; however in the future programs must be able to
@@ -51,6 +54,7 @@ to perform.  A trivial example is given in the `how to compile' section but the
 possibilities are clearly limited only by your imagination and programming
 skills.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.