Given a string like "Hello World", return:
👉 "olleH dlroW"
Each word is reversed individually, but the order of the words remains unchanged.
🔍 What You’ll Learn:
✅ 4 different methods to solve the problem:
List Comprehension – Pythonic and clean
For Loop – Step-by-step logic
Stack-Based – Learn character-level control
In-place Reversal – Space-efficient and interview-ready