Fix Checkstyle violations in BTree and BTreeTest

Author: skamble2

src/main/java/com/thealgorithms/datastructures/trees/BTree.java

@@ -1,7 +1,6 @@
 package com.thealgorithms.datastructures.trees;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 
 public class BTree {
     static class BTreeNode {
@@ -36,8 +35,8 @@ BTreeNode search(int key) {
             while (i < n && key > keys[i]) {
                 i++;
             }
-            if (i < n && keys[i] == key) return this;
-            if (leaf) return null;
+            if (i < n && keys[i] == key) {return this;}
+            if (leaf) {return null;}
             return children[i].search(key);
         }
 
@@ -115,7 +114,7 @@ void remove(int key) {
 
         private int findKey(int key) {
             int idx = 0;
-            while (idx < n && keys[idx] < key) ++idx;
+            while (idx < n && keys[idx] < key) {++idx;}
             return idx;
         }
 
@@ -262,7 +261,7 @@ public BTree(int t) {
     }
 
     public void traverse(ArrayList<Integer> result) {
-        if (root != null) root.traverse(result);
+        if (root != null) {root.traverse(result);}
     }
 
     public boolean search(int key) {
@@ -280,7 +279,7 @@ public void insert(int key) {
                 s.children[0] = root;
                 s.splitChild(0, root);
                 int i = 0;
-                if (s.keys[0] < key) i++;
+                if (s.keys[0] < key) {i++;}
                 s.children[i].insertNonFull(key);
                 root = s;
             } else {
@@ -290,7 +289,7 @@ public void insert(int key) {
     }
 
     public void delete(int key) {
-        if (root == null) return;
+        if (root == null) {return;}
         root.remove(key);
         if (root.n == 0) {
             root = root.leaf ? null : root.children[0];

src/test/java/com/thealgorithms/datastructures/trees/BTreeTest.java

@@ -1,7 +1,11 @@
 package com.thealgorithms.datastructures.trees;
 
-import static org.junit.jupiter.api.Assertions.*;
-import java.util.*;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.ArrayList;
+import java.util.Arrays;
 import org.junit.jupiter.api.Test;
 
 public class BTreeTest {