Remove unused imports and clean up CorrelationTest

Author: kvadrik

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

@@ -2,9 +2,6 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.CsvSource;
-
 /**
  * Test class for Correlation class
  */
@@ -18,13 +15,13 @@ public void testCorrelationFirst() {
         int n = 4;
         assertEquals(0.3319700011, Correlation.correlation(x, y, n), DELTA);
     }
-	
+
     public void testCorrelationSecond() {
         double[] x = {1, 2, 3, 4};
         double[] y = {5, 0, 9, 2};
         int n = 4;
         assertEquals(0, Correlation.correlation(x, y, n), DELTA);
-    }        
+    }
 
     public void testCorrelationConstant() {
         double[] x = {1, 2, 3};