Fix 2004/kopczynski and format fix README.md

The fix is that we cannot pass -ON to the compiler. With -ON it enters
an infinite loop as the variable l goes up, not down.

Format fix README.md.

Add kopczynski-a to show what happens when it's not a number.

2004/kopczynski/Makefile

@@ -66,7 +66,7 @@ CINCLUDE=
 
 # Optimization
 #
-OPT= -O3
+OPT= 
 
 # Default flags for ANSI C compilation
 #