Avoid damaging example citations

Previously, code blocks were treated like main text

baked.md

@@ -26,7 +26,7 @@ Released under the Creative Commons Attribution 4.0 license, known as CC BY 4.0.
 
 
 
-Version captured at 2024-01-17 14:20:55 UTC+1300
+Version captured at 2024-01-18 10:41:42 UTC+1300
 <!-- page break -->
 # book6: A Collaborative IPv6 Book.
 <img src="./book6logo.png" alt="book6 logo" width="200px" height="auto"/>
@@ -5241,9 +5241,9 @@ the file names. So here is the template for the list of sections after
 inserting links:
 
 ```
-  ## [First Section](#first-section)
-  ## [Section Template](#section-template)
-  ## [Last Section](#last-section)
+  ## [First Section](First%20Section.md)
+  ## [Section Template](Section%20Template.md)
+  ## [Last Section](Last%20Section.md)
 ```
 
 That's a bit complicated, and since file names are case-sensitive,
@@ -5333,7 +5333,7 @@ using the `mdformat` tool.
 Web references can be done in basic markdown form, i.e.:
 
 ```
-  [text](#url)               to refer to any valid URL
+  [text](URL)               to refer to any valid URL
 ```
 
 but a feature adapted from kramdown is also available, e.g.

utilities/bakeBook.py

@@ -7,7 +7,7 @@
 # Version: 2024-01-17 - case error in index citations
 #                     - fixed missing special cases for citations
 #                     - replace blobs with pilcrows for latex
-
+# Version: 2024-01-18 - skip code blocks when fixing citations
 
 ########################################################
 # Copyright (C) 2022-2023 Brian E. Carpenter.                  
@@ -117,10 +117,22 @@ def uncase(l):
 def fix_section(raw):
     """Change citations throughout a section"""
     new = []
+    skipping = False
     for line in raw:
         #latex doesn't like the blob character
         if '●' in line:
-            line=line.replace('●','¶')
+            line=line.replace('●','¶')    
+        if line.startswith("```") or line.startswith("~~~"):
+            if skipping:
+                #already in a code block, back to normal processing
+                skipping = False
+            else:
+                #entering a code block
+                skipping = True
+        if skipping:
+            #skip processing to avoid damaging example citations 
+            new.append(line)
+            continue
         if "](" in line:
             outline = ""
             while "](" in line: