improve how markdown code language is commented

We added a space between the markdown triple code mark
and language that was enclosed in HTML comments.

So a line of the form:

````
```<!---c--->
````

became:

````
``` <!---c--->
````

This was done to **help** some code see that the HTML comment
string was not a markdown code specifier.   Not all code
understands this after this changed.  For example, `pandoc(1)`
still forms HTML classes of the form "&lt;!---c--&gt;"
when it encounters the above mentioned change.

We also fixed a problem with `2019/dogon/README.md` regarding
a markdown code block.

We also fixed a problem with `2020/yang/README.md` regarding
a markdown code block.

1990/baruch/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -21,7 +21,7 @@ For more detailed information see [1990 baruch bugs](../../bugs.html#1990_baruch
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     echo 4 | ./baruch
     echo 7 | ./baruch
 ```
@@ -29,7 +29,7 @@ For more detailed information see [1990 baruch bugs](../../bugs.html#1990_baruch
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 
@@ -47,7 +47,7 @@ question. YMMV.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 

1990/cmills/README.md

@@ -1,20 +1,20 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./cmills [starting_cash]
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./cmills 5000
 ```
 

1990/dds/README.md

@@ -1,13 +1,13 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./dds
 ```
 
@@ -16,7 +16,7 @@
 
 Give the following lines as input:
 
-```<!---basic-->
+``` <!---basic-->
     OLD LANDER.BAS
     RUN
 ```

1990/dg/README.md

@@ -1,20 +1,20 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     echo foo bar | ./dg
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 
@@ -24,13 +24,13 @@
 Some C preprocessors got confused about single quotes in certain cases.
 In particular, the following source line:
 
-```<!---c-->
+``` <!---c-->
     b12(ase(bco(acp(bi(acp(bcp(acp(bpl(aqu(bqu(A))))))))))))))))))))))))))))))
 ```
 
 sometimes has to be changed to:
 
-```<!---c-->
+``` <!---c-->
     b12(ase(bco(acp(bi(acp(bcp(acp(bpl('A'))))))))))))))))))))))))))))
 ```
 
@@ -56,7 +56,7 @@ As for the rot13 algorithm, it relies on `index(3)` to find if the
 character is in the set `A-Za-z`. `l[]` is an array that gets filled
 with:
 
-```<!---c-->
+``` <!---c-->
     "nopqrstuvwxyzzzzabcdefghijklmmmmNOPQRSTUVWXYZZZZABCDEFGHIJKLMMMM"
 ```
 

1990/jaw/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -9,7 +9,7 @@
 
 To test the official C entry, one might try:
 
-```<!---sh-->
+``` <!---sh-->
     echo "Quartz glyph jocks vend, fix, BMW." | compress | ./btoa | ./jaw
 ```
 
@@ -19,7 +19,7 @@ sentence.
 
 #### Also try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 
@@ -39,14 +39,14 @@ it to 1530 bytes) which implements the complete shark utility. The script,
 The sender must have `compress` and `btoa`. To send, try:
 
 
-```<!---sh-->
+``` <!---sh-->
     ./shark.sh jaw.* README.md > receive
 ```
 
 The resulting file, `receive`, unpacks the input files
 even if the receiver lacks `uncompress` and `btoa`:
 
-```<!---sh-->
+``` <!---sh-->
     mkdir -p test
     cd test
     sh ../receive
@@ -168,7 +168,7 @@ Construct `sharkmail`, to auto-split `sharkives` into mailable segments and mail
 them. Here's a simple one, which could be extended to enable auto-reassembly
 with one shell cmd at the far end.
 
-```<!---sh-->
+``` <!---sh-->
     #!/bin/sh
     m=$1; shift
     shark $* | split -800 - /tmp/shark$$

1990/pjr/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -11,7 +11,7 @@ that can be used if your compiler is incapable of compiling `X=g()...` in
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./pjr
 ```
 
@@ -22,7 +22,7 @@ Note that some compilers will be unable to compile the expression `X=g()...` in
 `main()` due to lack of temporary stack space.  One might want to try replacing
 `main()` with:
 
-```<!---c-->
+``` <!---c-->
     main(){X=s().v().o().o().l().S().d().l().i().o().w().N();}
 ```
 
@@ -34,14 +34,14 @@ well.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
 
 ### Alternate use:
 
-```<!---sh-->
+``` <!---sh-->
     ./pjr.alt
 ```
 
@@ -74,7 +74,7 @@ opposite:
 
 To encode a new string input the string as it is meant to come out:
 
-```<!---c-->
+``` <!---c-->
     X=s().v().o().o().l().S().d().l().i().o().w().N();
 ```
 

1990/scjones/README.md

@@ -1,20 +1,20 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./scjones
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 

1990/stig/README.md

@@ -1,19 +1,19 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 NOTE: that's not a typo or mistake but one can also do:
 
-```<!---sh-->
+``` <!---sh-->
     ./o
 ```
 

1990/tbr/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -25,7 +25,7 @@ In 2023 it was noticed that in some systems like macOS there was confusing
 output due to a warning at runtime that was interspersed with the output of the
 program. For instance it would show:
 
-```<!---sh-->
+``` <!---sh-->
     ./tbr
     $ warning: this program uses gets(), which is unsafe.
 ```
@@ -40,7 +40,7 @@ below, in the [alternate version](#alternate-code) section.
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./tbr
     $ enter some shell commands
 ```
@@ -54,7 +54,7 @@ just `exit` or `logout`? Hint: see the authors' remarks.
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./tbr
     $ ls -l tbr tbr.c
 
@@ -79,7 +79,7 @@ documented, are not considered bugs as such in the context of the contest.
 The authors supplied us with a slightly smaller unformatted version
 of the program which we include below:
 
-```<!---c-->
+``` <!---c-->
     #define D ,close(
     char*c,q[512],m[256],*v[99],**u,*i[3];int f[2],p;main(){for(m[m[60]=m[62]=
     32]=m[*m=124[m]=9]=6;e(-8),gets(1+(c=q))||(exit(0),0);r(0,0))for(;*++c;);}
@@ -99,14 +99,14 @@ equivalent like the authors intended.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
 
 ### Alternate use:
 
-```<!---sh-->
+``` <!---sh-->
     ./tbr.alt
 ```
 
@@ -165,13 +165,13 @@ argument is stolen every time a `>` or `<` is encountered.  The
 shell flags an error if no arguments are on the stack. Thus, for
 example:
 
-```<!---sh-->
+``` <!---sh-->
     cat > foo > bar
 ```
 
 cats to `foo`, since it was pushed last, but
 
-```<!---sh-->
+``` <!---sh-->
     cat > > foo bar
 ```
 

1990/theorem/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -18,7 +18,7 @@ For more detailed information see [1990 theorem bugs](../../bugs.html#1990_theor
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./theorem expression x1 x2 h y1
 ```
 
@@ -35,7 +35,7 @@ where:
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 
@@ -62,7 +62,7 @@ left to right.  (i.e., parenthesis aren't supported).
 
 Try running the program with the following args:
 
-```<!---sh-->
+``` <!---sh-->
     ./theorem y 0 1 0.1 1
     ./theorem 1/x 1 2 0.1 0
     ./theorem 'x^2/y+x' 0 1 0.1 6
@@ -71,14 +71,14 @@ Try running the program with the following args:
 But wait, there is more!  You also get, free of charge, a
 reversing filter!  Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./theorem -r 0 0 0 0 < theorem.c > sorter.c
 ```
 
 Still not impressed?  The author throws in for free, a
 sort program! Try:
 
-```<!---sh-->
+``` <!---sh-->
     make sorter
     ls | ./sorter
 ```
@@ -87,14 +87,14 @@ This program is safe for home use as well.  The author has
 included a safety feature in case you misplace the original
 program source:
 
-```<!---sh-->
+``` <!---sh-->
     ./sorter -r 0 0 0 0 < sorter.c > theorem_bkp.c
 ```
 
 And finally, as a special offer to users of this entry,
 the author provides a Fibonacci sequence generator!  Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./sorter 0 0 0 0 < theorem.c > fibonacci.c
     make fibonacci
     ./fibonacci 1 1

1990/westley/README.md

@@ -1,13 +1,13 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./westley <number>
 ```
 
@@ -16,7 +16,7 @@ The number should be greater than 0.
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 
@@ -30,14 +30,14 @@ The alternate code is provided to show how C changed.
 
 If you have an old enough compiler try and to see how C has changed over the years:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
 
 ### Alternate use:
 
-```<!---sh-->
+``` <!---sh-->
     ./westley.alt <number>
 ```