[MM-593] Added escape characters to user, repo and path in permalink …

…preview (#803)

* [MM-593] Added escape characters to user, repo and path in permalink preview

* [MM-593] Fix lint errors

server/plugin/utils.go

@@ -300,6 +300,9 @@ func isInsideLink(msg string, index int) bool {
 
 // getCodeMarkdown returns the constructed markdown for a permalink.
 func getCodeMarkdown(user, repo, repoPath, word, lines string, isTruncated bool) string {
+	user = strings.ReplaceAll(user, "_", "\\_")
+	repo = strings.ReplaceAll(repo, "_", "\\_")
+	repoPath = strings.ReplaceAll(repoPath, "_", "\\_")
 	final := fmt.Sprintf("\n[%s/%s/%s](%s)\n", user, repo, repoPath, word)
 	ext := path.Ext(repoPath)
 	// remove the preceding dot