added utils module

src/utils.rs

@@ -0,0 +1,31 @@
+use std::{
+    fs::{self, DirEntry},
+    path::{Path, PathBuf},
+};
+
+pub fn walk_files_recursive(
+    root: impl AsRef<Path>,
+) -> std::io::Result<impl Iterator<Item = DirEntry>> {
+    fn visit(dir: &Path, out: &mut Vec<DirEntry>) -> std::io::Result<()> {
+        for entry in fs::read_dir(dir)? {
+            let entry = entry?;
+            let path = entry.path();
+            let file_type = entry.file_type()?;
+
+            if file_type.is_dir() {
+                visit(&path, out)?;
+            } else if file_type.is_file() {
+                out.push(entry);
+            }
+        }
+        Ok(())
+    }
+
+    let mut files = Vec::new();
+    visit(root.as_ref(), &mut files)?;
+    Ok(files.into_iter())
+}
+
+pub fn path_to_lowercase(path: impl AsRef<Path>) -> PathBuf {
+    PathBuf::from(path.as_ref().to_string_lossy().to_lowercase())
+}