Remove trailing spaces and ensure newline at EOF

Author: Ayush41

src/main/java/com/thealgorithms/recursion/Factorial.java

@@ -20,7 +20,7 @@ private Factorial() {
    * @return factorial of n
    * @throws IllegalArgumentException if n is negative
    */
-  
+
    public static long factorial(int n) {
     if (n < 0) {
       throw new IllegalArgumentException("Factorial is not defined for negative numbers.");

src/test/java/com/thealgorithms/recursion/FactorialTest.java

@@ -10,24 +10,24 @@ public class FactorialTest {
     public void testFactorialOfZero() {
         assertEquals(1, Factorial.factorial(0));
     }
-    
+
     @Test
     public void testFactorialOfOne() {
         assertEquals(1, Factorial.factorial(1));
   }
-  
+
   @Test
   public void testFactorialOfPositiveNumbers() {
     assertEquals(120, Factorial.factorial(5));
     assertEquals(720, Factorial.factorial(6));
     assertEquals(5040, Factorial.factorial(7));
   }
-  
+
   @Test
   public void testFactorialOfTen() {
     assertEquals(3628800, Factorial.factorial(10));
   }
-  
+
   @Test
   public void testNegativeNumberThrowsException() {
     assertThrows(IllegalArgumentException.class, () -> Factorial.factorial(-1));