Moved OTP to SMS module

src/sms-orchestration/otp-generator.service.ts

@@ -0,0 +1,16 @@
+import { Injectable } from "@nestjs/common";
+const crypto = require("node:crypto");
+
+@Injectable()
+export class OtpGeneratorService {
+  createDigit(digits: number): string {
+    const max = Math.pow(10, digits);
+    const randomBytes = crypto.randomBytes(Math.ceil(digits / 2));
+    const randomNumber = parseInt(randomBytes.toString("hex"), 16) % max;
+    return randomNumber.toString().padStart(digits, "0");
+  }
+
+  create() {
+    return this.createDigit(5);
+  }
+}