🔀 Merge Two Strings Alternately | C++ Code | Efficient String Problem

In this video, learn how to merge two strings alternately using C++. The algorithm combines characters from both strings in order, and handles different lengths efficiently.

📌 **Problem Statement:**
Merge strings S1 and S2 such that characters alternate from each string. If one string is longer, append the remaining characters.

💡 **Examples:**
➤ Input: `"Hello"`, `"Bye"` → Output: `"HBeylelo"`
➤ Input: `"abc"`, `"def"` → Output: `"adbecf"`

🧠 Time Complexity: O(|S1| + |S2|)
📦 Space Complexity: O(1)

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