Format fixes in 1990/dg/README.md

1990/dg/README.md

@@ -2,43 +2,52 @@
 
 David Goodenough  
 anonymous organization   
-	541 Commonwealth Ave,
+541 Commonwealth Ave  
 Newton, MA 02159  
 USA  
 
 ## To build:
 
+```sh
 make all
+```
 
 
 ## To run:
 
+```sh
 echo foo bar | ./dg
+```
 
 ## Try:
 
+```sh
 echo "to C or not to C" | ./dg
+```
 
 ## Judges' comments:
 
 Some C preprocessors got confused about single quotes in certain cases.
 In particular, the following source line:
 
+```c
 b12(ase(bco(acp(bi(acp(bcp(acp(bpl(aqu(bqu(A))))))))))))))))))))))))))))))
+```
 
 sometimes has to be changed to:
 
+```c
 b12(ase(bco(acp(bi(acp(bcp(acp(bpl('A'))))))))))))))))))))))))))))
+```
 
-if the C preprocessor botches single quotes in cpp expansions, which we have
+particularly if the C preprocessor botches single quotes in cpp expansions,
-done for the wider audience.
+which we have done for the wider audience.
 
 
 ## Author's comments:
 
-If my preprocessor could hack it, I could write this as one single
+If my preprocessor could hack it, I could write this as one single line rather
-line rather than 4, but when I do that I get a complaint "defines
+than 4, but when I do that I get a complaint "defines nested too deeply".
-nested too deeply".
 
 Spoiler: (rot13 to read)