refactor: update import paths to use internal package

internal/utils/file_utils.go

@@ -0,0 +1,12 @@
+package utils
+
+import "os"
+
+// IsValidFolder checks if the provided path is a valid directory
+func IsValidFolder(path string) bool {
+	info, err := os.Stat(path)
+	if err != nil {
+		return false
+	}
+	return info.IsDir()
+}