fixing code validation, and also added rename instance

src/util.rs

@@ -0,0 +1,15 @@
+use std::path::Path;
+
+pub fn is_valid_name(name: &str) -> bool {
+    let mut components = Path::new(name).components();
+    matches!(
+        (components.next(), components.next()),
+        (Some(std::path::Component::Normal(_)), None)
+    )
+}
+pub fn is_safe_relative_path(path: &str) -> bool {
+    let p = Path::new(path);
+    !p.as_os_str().is_empty()
+        && p.components()
+            .all(|c| matches!(c, std::path::Component::Normal(_)))
+}