Remove main function from GCD class (#5828)

src/main/java/com/thealgorithms/maths/GCD.java

@@ -1,9 +1,23 @@
 package com.thealgorithms.maths;
 
 /**
- * This is Euclid's algorithm, used to find the greatest common
- * denominator Override function name gcd
+ *  This class provides methods to compute the Greatest Common Divisor (GCD) of two or more integers.
  *
+ * The Greatest Common Divisor (GCD) of two or more integers is the largest positive integer that divides each of the integers without leaving a remainder.
+ *
+ * The GCD can be computed using the Euclidean algorithm, which is based on the principle that the GCD of two numbers also divides their difference.
+ *
+ * For more information, refer to the
+ * <a href="https://en.wikipedia.org/wiki/Greatest_common_divisor">Greatest Common Divisor</a> Wikipedia page.
+ *
+ * <b>Example usage:</b>
+ * <pre>
+ * int result1 = GCD.gcd(48, 18);
+ * System.out.println("GCD of 48 and 18: " + result1); // Output: 6
+ *
+ * int result2 = GCD.gcd(48, 18, 30);
+ * System.out.println("GCD of 48, 18, and 30: " + result2); // Output: 6
+ * </pre>
  * @author Oskar Enmalm 3/10/17
  */
 public final class GCD {
@@ -40,7 +54,7 @@ public final class GCD {
      * @param numbers the input array
      * @return gcd of all of the numbers in the input array
      */
-    public static int gcd(int[] numbers) {
+    public static int gcd(int... numbers) {
         int result = 0;
         for (final var number : numbers) {
             result = gcd(result, number);
@@ -48,12 +62,4 @@ public final class GCD {
 
         return result;
     }
-
-    public static void main(String[] args) {
-        int[] myIntArray = {4, 16, 32};
-
-        // call gcd function (input array)
-        System.out.println(gcd(myIntArray)); // => 4
-        System.out.printf("gcd(40,24)=%d gcd(24,40)=%d%n", gcd(40, 24), gcd(24, 40)); // => 8
-    }
 }

src/test/java/com/thealgorithms/maths/GCDTest.java

@@ -40,6 +40,11 @@ public class GCDTest {
         Assertions.assertEquals(GCD.gcd(9, 6), 3);
     }
 
+    @Test
+    void test8() {
+        Assertions.assertEquals(GCD.gcd(48, 18, 30, 12), 6);
+    }
+
     @Test
     void testArrayGcd1() {
         Assertions.assertEquals(GCD.gcd(new int[] {9, 6}), 3);