Make FindMin a proper utilty class (TheAlgorithms#4397)

Author: vil02

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

@@ -1,26 +1,7 @@
 package com.thealgorithms.maths;
 
-import java.util.Arrays;
-import java.util.Random;
-
-public class FindMin {
-
- /**
- * Driver Code
- */
- public static void main(String[] args) {
- Random random = new Random();
-
- /* random size */
- int size = random.nextInt(100) + 1;
- int[] array = new int[size];
-
- /* init array with random numbers */
- for (int i = 0; i < size; i++) {
- array[i] = random.nextInt() % 100;
- }
-
- assert Arrays.stream(array).min().getAsInt() == findMin(array);
+public final class FindMin {
+ private FindMin() {
  }
 
  /**
@@ -30,7 +11,7 @@ public static void main(String[] args) {
  * @exception IllegalArgumentException input array is empty
  * @return the mimum value stored in the input array
  */
- public static int findMin(int[] array) {
+ public static int findMin(final int[] array) {
  if (array.length == 0) {
  throw new IllegalArgumentException("array must be non-empty.");
  }