feat: Add FunctionsCC2 class with calculateSum returning result

WHAT the code does:
- Defines a `FunctionsCC2` class with a static method `calculateSum(int num1, int num2)`.
- Unlike the previous version, this method **returns** the sum instead of printing it.
- `main()` calls `calculateSum(3, 4)` and prints the returned result → `7`.

WHY this matters:
- Demonstrates the difference between methods that **return values** vs those that only print.
- Returning values increases **reusability** since the result can be stored, reused, or combined with other logic.
- Highlights better design for utility methods.

HOW it works:
1. `calculateSum(3, 4)` computes `7`.
2. Method returns `7` to the caller.
3. `main()` prints the returned value.

Tips & gotchas:
- Returning instead of printing allows combining results in further calculations.
- If used in multiple places, avoids redundant printing.
- Works for integers only — overloading or using generics could extend flexibility.
- For larger ranges or performance-critical cases, ensure integer overflow is considered.

Use-cases:
- Educational example for **methods with return values**.
- Building block for calculator applications.
- Utility function for number-crunching programs.
- Serves as a comparison against `FunctionsCC` which prints directly.

Short key: class-functions cc2-calculate sum-return.

Signed-off-by: https://github.com/Someshdiwan <[email protected]>

Author: Someshdiwan

Section10Methods/PracticeProblems/src/FunctionsCC2.java

@@ -2,8 +2,7 @@ public class FunctionsCC2 {
     public static int calculateSum(int num1, int num2){
         return num1 + num2;
     }
-    public static void main(String[] args)
-    {
+    public static void main(String[] args) {
         System.out.println(calculateSum(3, 4));
     }
-}
+}