refactor: renamed multiply to product

src/main/java/com/ap/ReportGenerator.java

@@ -5,7 +5,7 @@ public class ReportGenerator {
         Calculator calc = new BasicCalculator();
         int sum = calc.add(x, y);
         int diff = calc.subtract(x, y);
-        int product = calc.multiply(x, y);
+        int product = calc.product(x, y);
         int max = MathHelper.max(x, y);
         System.out.println("Sum: " + sum + ", Diff: " + diff +
                 ", Product: " + product + ", Max: " + max);