diff --git a/src/App.tsx b/src/App.tsx
index 46fff41..1024f86 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -14,11 +14,10 @@ import Telegram, {
   uploadBigFile,
   sendFile,
   downloadFile,
-} from "./telegram";
+} from "./telegram/telegram";
 import SendIcon from "@mui/icons-material/Send";
 import { User } from "./user";
 import { Download, Upload } from "@mui/icons-material";
-import ab2str from "./utils/arraybuffer2str";
 
 function App() {
   let [phone, setPhone] = useState("");
diff --git a/src/component/countriesInput.tsx b/src/component/countriesInput.tsx
index ef033ff..61d3e3d 100644
--- a/src/component/countriesInput.tsx
+++ b/src/component/countriesInput.tsx
@@ -1,6 +1,6 @@
 import { Autocomplete, Box, TextField } from "@mui/material";
 import React, { useEffect, useState } from "react";
-import Telegram from "../telegram";
+import Telegram from "../telegram/telegram";
 
 export interface Country {
   default_name: string;
diff --git a/src/telegram.ts b/src/telegram/telegram.ts
similarity index 77%
rename from src/telegram.ts
rename to src/telegram/telegram.ts
index a9f9817..22caa36 100644
--- a/src/telegram.ts
+++ b/src/telegram/telegram.ts
@@ -1,5 +1,5 @@
 import Client from "mtproton/envs/browser";
-import between from "./utils/rand";
+import { rand_id } from "../utils/rand";
 
 class TelegramHelper {
   private client: any;
@@ -51,7 +51,7 @@ class TelegramHelper {
 async function uploadBigFile(
   bytes: ArrayBuffer
 ): Promise<{ file_id: number; total_part: number }> {
-  let file_id = between(10000, 99999);
+  let file_id = rand_id();
   console.log("file_id", file_id);
 
   let uploadBytes = new Uint8Array(bytes);
@@ -96,7 +96,7 @@ function inputFile(file_id: number, part_number: number, file_name: string) {
 }
 
 function sendFile(inputFile: any, type: string) {
-  let random_id = between(10000, 99999);
+  let random_id = rand_id();
   console.log("random_id", random_id);
   return Telegram.call("messages.sendMedia", {
     peer: {
@@ -113,7 +113,7 @@ function sendFile(inputFile: any, type: string) {
         },
       ],
     },
-    random_id: between(10000, 99999),
+    random_id: rand_id(),
     message: "test",
   });
 }
@@ -167,54 +167,5 @@ const appID = 18987971;
 const appHash = "fcfd9e6ed3f9e48a360bb57cc0d59d98";
 let Telegram = new TelegramHelper(appID, appHash);
 
-function hexStringToArrayBuffer(hexString: string) {
-  // remove the leading 0x
-  hexString = hexString.replace(/^0x/, "");
-
-  // ensure even number of characters
-  if (hexString.length % 2 != 0) {
-    console.log(
-      "WARNING: expecting an even number of characters in the hexString"
-    );
-  }
-
-  // check for some non-hex characters
-  let bad = hexString.match(/[G-Z\s]/i);
-  if (bad) {
-    console.log("WARNING: found non-hex characters", bad);
-  }
-
-  // split the string into pairs of octets
-  let pairs = hexString.match(/[\dA-F]{2}/gi);
-
-  // convert the octets to integers
-  // @ts-ignore
-  let integers = pairs.map(function (s: string) {
-    return parseInt(s, 16);
-  });
-
-  let array = new Uint8Array(integers);
-  console.log(array);
-
-  return array.buffer;
-}
-
-function arrayBufferToHex(arrayBuffer: ArrayBuffer) {
-  if (typeof arrayBuffer !== "object" || arrayBuffer === null) {
-    throw new TypeError("Expected input to be an ArrayBuffer");
-  }
-
-  let view = new Uint8Array(arrayBuffer);
-  let result = "";
-  let value;
-
-  for (let i = 0; i < view.length; i++) {
-    value = view[i].toString(16);
-    result += value.length === 1 ? "0" + value : value;
-  }
-
-  return result;
-}
-
 export default Telegram;
 export { uploadBigFile, inputFile, sendFile, downloadFile };
diff --git a/src/telegram/user.ts b/src/telegram/user.ts
new file mode 100644
index 0000000..e69de29
diff --git a/src/utils/rand.ts b/src/utils/rand.ts
index 49ecb81..2c05b66 100644
--- a/src/utils/rand.ts
+++ b/src/utils/rand.ts
@@ -2,4 +2,8 @@ function between(min: number, max: number): number {
   return Math.floor(Math.random() * (max - min) + min);
 }
 
-export default between;
+function rand_id(): number {
+  return between(100000, 999999);
+}
+
+export { between, rand_id };