diff --git a/src/misc.ts b/src/misc.ts
index c579ec7..e66cae1 100644
--- a/src/misc.ts
+++ b/src/misc.ts
@@ -46,8 +46,8 @@ export const getFolderLevels = (x: string) => {
   let i = 0;
   for (let index = 0; index + 1 < y1.length; index++) {
     const k = y1.slice(0, index + 1).join("/");
-    if (k !== '' && k!== '/') {
-      res.push(k)
+    if (k !== "" && k !== "/") {
+      res.push(k);
     }
   }
   return res;
@@ -145,3 +145,13 @@ export const getPathFolder = (a: string) => {
   const b = path.posix.dirname(a);
   return b.endsWith("/") ? b : `${b}/`;
 };
+
+/**
+ * https://stackoverflow.com/questions/54511144
+ * @param a
+ * @param delimiter
+ * @returns
+ */
+export const setToString = (a: Set<string>, delimiter: string = ",") => {
+  return [...a].join(delimiter);
+};
diff --git a/tests/misc.test.ts b/tests/misc.test.ts
index 35867fb..4022a0a 100644
--- a/tests/misc.test.ts
+++ b/tests/misc.test.ts
@@ -70,7 +70,7 @@ describe("Misc: get folder levels", () => {
     expect(misc.getFolderLevels(item3)).to.deep.equal(res3);
   });
 
-  it("should treat path starting with / correctly", ()=> {
+  it("should treat path starting with / correctly", () => {
     const item = "/xxx/yyy/zzz.md";
     const res = ["/xxx", "/xxx/yyy"];
     expect(misc.getFolderLevels(item)).to.deep.equal(res);