fix(curriculam): include initStack in stack implementation requirements (freeCodeCamp#66846)

Co-authored-by: Venkat <venkat@Venkats-MacBook-Pro.local>

Author: Venkat-Entropik

curriculum/challenges/english/blocks/lab-implement-a-stack/69a92f0b9cc04bb0d5327bb5.md

@@ -13,13 +13,14 @@ In this lab, you will implement a stack data structure using functions. A stack
 
 **User Stories:**
 
+1. You should have an `initStack` function that returns an object with a `collection` property set to an empty array.
 1. You should have a `push` function that adds an element to the top of the stack.
 1. You should have a `pop` function that removes and returns the top element of the stack, or `undefined` if there isn't one.
 1. You should have a `peek` function that returns the top element of the stack without removing it, or `undefined` if there isn't one.
-1. You should have a `isEmpty` function that returns `true` if the stack contains no elements, and `false` otherwise.
+1. You should have an `isEmpty` function that returns `true` if the stack contains no elements, and `false` otherwise.
 1. You should have a `clear` function that removes all elements from the stack.
 
-**Note:** Most tests depend on the `push` function. Implement `push` first, as tests for `pop`, `peek`, `isEmpty`, and `clear` require adding elements to the stack.
+**Note:** Most tests depend on the `initStack` and `push` functions. Implement them first, as tests for `pop`, `peek`, `isEmpty`, and `clear` require adding elements to the stack.
 
 # --hints--