gracefull shutdown for unresolvable errors

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"log"
 	"nto_cli/cmd"
 	"nto_cli/generation"
 	"nto_cli/utils"
@@ -8,13 +9,13 @@ import (
 )
 
 func main() {
+	log.SetFlags(0)
 	structNames, path := cmd.SelectionInput()
 
 	for _, structName := range structNames {
 		file, err := os.Open(path)
-		defer file.Close()
 		if err != nil {
-			panic(err)
+			log.Fatalf("Failed to open file: %s", err)
 		}
 		structFields := utils.GetStructFields(file, structName)
 		generation.Generate(structName, structFields)