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

1989/jar.2/README.md

@@ -7,6 +7,7 @@ Otakaari 1\
 02150 Espoo\
 Finland
 
+
 ## To build:
 
 ```sh
@@ -27,7 +28,8 @@ make all
 
 NOTE: this entry will likely segfault on invalid input.
 
-## Try:
+
+### Try:
 
 ```sh
 ./try.sh
@@ -114,6 +116,7 @@ made using string representations of the lists. These operations
 must count parentheses and skip whitespace. This leads to extremely
 poor performance!
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.