feat: creates backend for the project

backend/src/utils.ts

@@ -0,0 +1,18 @@
+import { Request, Response, NextFunction } from 'express';
+
+export function maskAccountNumber(num: string): string {
+  if (num.length <= 10) return num;
+  return num.slice(0, 6) + '*'.repeat(num.length - 10) + num.slice(-4);
+}
+
+export function escapeLike(input: string): string {
+  return input.replace(/\\/g, '\\\\').replace(/%/g, '\\%').replace(/_/g, '\\_');
+}
+
+type AsyncHandler = (req: Request, res: Response, next: NextFunction) => Promise<void>;
+
+export function asyncHandler(fn: AsyncHandler) {
+  return (req: Request, res: Response, next: NextFunction) => {
+    fn(req, res, next).catch(next);
+  };
+}