feat: Add FunctionsCC class with calculateSum method

WHAT the code does:
- Defines a `FunctionsCC` class with a static method `calculateSum(int num1, int num2)`.
- `calculateSum()` computes the sum of two integers and prints the result.
- `main()` demonstrates by calling `calculateSum(3, 4)` → prints `7`.

WHY this matters:
- Demonstrates creating and invoking a **user-defined method** with parameters.
- Reinforces how arguments are passed into methods.
- Introduces basic function abstraction for code reuse.

HOW it works:
1. `calculateSum(3, 4)` → adds numbers to get `7`.
2. Prints the result directly from inside the method.

Tips & gotchas:
- Prints the sum but doesn’t return it → less flexible for reuse in other calculations.
- Could be modified to `return int` instead of `void` for broader utility.
- Works only for two integers; overloading or varargs could allow more flexibility.
- Use descriptive messages in output for clarity.

Use-cases:
- Educational demo for **methods with parameters**.
- Simple utility for arithmetic practice.
- Starter point for building calculator-like applications.
- Helps beginners separate logic into reusable methods.

Short key: class-functions cc-calculate sum.

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

Author: Someshdiwan

Section10Methods/PracticeProblems/src/FunctionsCC.java

@@ -1,12 +1,9 @@
-public class FunctionsCC
-{
-    public static void calculateSum(int num1, int num2)
-    {
+public class FunctionsCC {
+    public static void calculateSum(int num1, int num2) {
         int result = num1 + num2;
         System.out.println(result);
     }
-    public static void main(String [] args)
-    {
+    public static void main(String [] args) {
         calculateSum(3, 4);
     }
 }