Is that ok to ignore the workplace case sensitive on macOS about cli

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[ccqpein]

I make the change in my local

modified   workspace/workspace.go
@@ -123,11 +123,11 @@ func (ws Workspace) Exercises() ([]Exercise, error) {
 func (ws Workspace) ExerciseDir(s string) (string, error) {
 	if !strings.HasPrefix(s, ws.Dir) {
 		var err = fmt.Errorf("not in workspace")
-		if runtime.GOOS == "darwin" {
-			err = fmt.Errorf("%w: directory location may be case sensitive: workspace directory: %s, "+
-				"submit path: %s", err, ws.Dir, s)
+		if runtime.GOOS != "darwin" {
+			return "", err
+		} else if !strings.HasPrefix(strings.ToLower(s), strings.ToLower(ws.Dir)) {
+			return "", err
 		}
-		return "", err
 	}
 
 	path := s

And looks like it can handle both upper/lower case when I try to submit. (and the unit test failed ofc)

I am not sure if anywhere else use this method (I only find it referenced in cmd/submit.go.

If you guys think this change is making sense, I can give a PR to make this change.