fix: improve error message formatting and enhance comments for clarity

main.go

@@ -216,14 +216,13 @@ Options:
 
 	cfg, err := ini.Load("/root/.acme.ini")
 	if err != nil {
-		fmt.Printf("Fail to read file: %v", err)
+		fmt.Printf("Fail to read file: %v\n", err)
 		os.Exit(1)
 	}
 	bearerToken = cfg.Section("acme").Key("bearer_token").String()
-	// remove leading and trailing spaces and quotes and split by comma
 	acmeProvidersRaw := cfg.Section("acme").Key("acme_providers").String()
-	acmeProvidersRaw = strings.Trim(acmeProvidersRaw, "[] ")
-	acmeProviders := strings.Split(acmeProvidersRaw, ",")
+	acmeProvidersRaw = strings.Trim(acmeProvidersRaw, "[] ") // remove leading and trailing brackets and spaces
+	acmeProviders := strings.Split(acmeProvidersRaw, ",")    // split by comma
 	for i := range acmeProviders {
 		acmeProviders[i] = strings.Trim(acmeProviders[i], "' ")
 	}