refactor: replace edit with edit() syntax for testing

Author: eszmw

InstructorResources/Solutions/CommentingCodeSoln.mlx

@@ -2,4 +2,9 @@
 % ---- Known Issues     -----
 KnownIssuesID = "";
 % ---- Pre-run commands -----
- 
+edit = @(str)MyEdit(str);
+
+function MyEdit(str)
+assert(exist(str,"file"))
+disp("Edit the file " + str)
+end

Scripts/CommentingCode.mlx

@@ -4,4 +4,11 @@
 % ---- Pre-run commands -----
 
 addpath(genpath(fullfile(currentProject().RootFolder,...
-    "InstructorResources","Solutions","FunctionLibrarySoln")))
+    "InstructorResources","Solutions","FunctionLibrarySoln")))
+
+edit = @(str)MyEdit(str);
+
+function MyEdit(str)
+assert(exist(str,"file"))
+disp("Edit the file " + str)
+end