remove unique true from user schema

Author: myix765

api/schemas/User.js

@@ -8,7 +8,7 @@ const UserSchema = new Schema({
     gender: { type: String },
     age: { type: Number },
     email: { type: String, required: true, unique: true },
-    whatsapp: { type: String, unique: true },
+    whatsapp: { type: String },
     privilege: { type: String, default: "student", enum: ["admin", "instructor", "student"] },
     clerkId: { type: String, required: true },
     creationDate: { type: Date, default: Date.now },