implemented bill deletion + var rename

app/lib/fetchBillById.ts

@@ -1,31 +1,2 @@
-import { PlainBill, MongoLocation } from '@/app/lib/db-types';
-import clientPromise from '@/app/lib/mongodb';
-
-export const fetchBillById = async (locationID:string, billID:string) => {
-    const client = await clientPromise;
-    const db = client.db("rezije");
-
-    // find a location with the given locationID
-    const billLocation = await db.collection<MongoLocation>("lokacije").findOne({ _id: locationID })
-
-    if(!billLocation) {
-        console.log(`Location ${locationID} not found`);
-        return(null);
-    }
-
-    // find a bill with the given billID
-    const mongoBill = billLocation?.bills.find(({ _id }) => _id.toString() === billID);
-
-    if(!mongoBill) {
-        console.log('Bill not found');
-        return(null);
-    }
-
-    const { _id, ...billBase  } = mongoBill;
-
-    return({
-        id: _id.toString(),
-        ...billBase
-    } as PlainBill);
-
-}
+import { Bill, BillingLocation } from '@/app/lib/db-types';
+import clientPromise from '@/app/lib/mongodb';