diff --git a/build.gradle.kts b/build.gradle.kts
index 334f030..7381e5d 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -22,7 +22,7 @@ dependencies {
     testImplementation(Config.Libs.junit)
     testImplementation(Config.Libs.kluent)
     testImplementation(Config.Libs.mockk)
-    testImplementation (Config.Libs.jetbrainJunit)
+    testImplementation(Config.Libs.jetbrainJunit)
     // testImplementation(Config.Libs.spekDsl)
 
     testRuntimeOnly(Config.Libs.junitEngine)
diff --git a/src/main/kotlin/it/norangeb/algorithms/datastructures/dictionary/ImmutableBST.kt b/src/main/kotlin/it/norangeb/algorithms/datastructures/dictionary/ImmutableBST.kt
index 7abbb70..8794e84 100644
--- a/src/main/kotlin/it/norangeb/algorithms/datastructures/dictionary/ImmutableBST.kt
+++ b/src/main/kotlin/it/norangeb/algorithms/datastructures/dictionary/ImmutableBST.kt
@@ -25,7 +25,11 @@
 
 package it.norangeb.algorithms.datastructures.dictionary
 
-import arrow.core.*
+import arrow.core.getOrElse
+import arrow.core.None
+import arrow.core.Option
+import arrow.core.Some
+import arrow.core.toOption
 
 class ImmutableBST<K : Comparable<K>, V> : OrderedDictionary<K, V> {
     private var root: Option<Node<K, V>> = None
@@ -47,7 +51,8 @@ class ImmutableBST<K : Comparable<K>, V> : OrderedDictionary<K, V> {
 
     private fun set(
         node: Option<Node<K, V>>,
-        key: K, value: V
+        key: K,
+        value: V
     ): Option<Node<K, V>> = node.fold(
         { Node(key, value) },
         {
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/bag/LinkedListBagTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/bag/LinkedListBagTest.kt
index aa193ff..bc3787a 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/bag/LinkedListBagTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/bag/LinkedListBagTest.kt
@@ -30,7 +30,7 @@ import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class LinkedListBagTest {
-    private lateinit var bag :LinkedListBag<Int>
+    private lateinit var bag: LinkedListBag<Int>
 
     @BeforeEach
     fun init() {
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/bag/ResizingArrayBagTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/bag/ResizingArrayBagTest.kt
index c94f3c2..8feca71 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/bag/ResizingArrayBagTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/bag/ResizingArrayBagTest.kt
@@ -30,7 +30,7 @@ import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class ResizingArrayBagTest {
-    private lateinit var bag :ResizingArrayBag<Int>
+    private lateinit var bag: ResizingArrayBag<Int>
 
     @BeforeEach
     fun makeBag() {
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/dictionary/ImmutableBSTTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/dictionary/ImmutableBSTTest.kt
index b999f12..8706e27 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/dictionary/ImmutableBSTTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/dictionary/ImmutableBSTTest.kt
@@ -32,7 +32,6 @@ import org.amshove.kluent.`should be`
 import org.amshove.kluent.shouldEqual
 import org.junit.jupiter.api.Test
 
-
 class ImmutableBSTTest {
 
     @Test
@@ -42,8 +41,8 @@ class ImmutableBSTTest {
         orderedMap.isEmpty() `should be` true
         orderedMap.size() `should be equal to` 0
         orderedMap.contains("UNO") `should be` false
-        orderedMap.max() shouldEqual  None
-        orderedMap.min() shouldEqual  None
+        orderedMap.max() shouldEqual None
+        orderedMap.min() shouldEqual None
 
         orderedMap["QUATTRO"] = 4
         orderedMap["UNO"] = 0
@@ -84,25 +83,25 @@ class ImmutableBSTTest {
 
         orderedMap.size() `should be equal to` 9
 
-        //delete node with no child
+        // delete node with no child
         orderedMap.delete(1)
 
         orderedMap.size() `should be equal to` 8
-        orderedMap.min() shouldEqual  Some(2)
+        orderedMap.min() shouldEqual Some(2)
 
-        //delete node with only right child
+        // delete node with only right child
         orderedMap.delete(2)
 
         orderedMap.size() `should be equal to` 7
-        orderedMap.min() shouldEqual  Some(3)
+        orderedMap.min() shouldEqual Some(3)
 
-        //delete node with two child
+        // delete node with two child
         orderedMap.delete(10)
 
         orderedMap.size() `should be equal to` 6
 
         orderedMap.delete(13)
-        //delete node with only left child
+        // delete node with only left child
         orderedMap.delete(11)
 
         orderedMap.size() `should be equal to` 4
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/queue/LinkedListQueueTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/queue/LinkedListQueueTest.kt
index 43ca44d..834484d 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/queue/LinkedListQueueTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/queue/LinkedListQueueTest.kt
@@ -33,7 +33,7 @@ import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class LinkedListQueueTest {
-    private lateinit var queue : LinkedListQueue<Int>
+    private lateinit var queue: LinkedListQueue<Int>
 
     @BeforeEach
     fun makeQueue() {
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/queue/ResizingArrayQueueTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/queue/ResizingArrayQueueTest.kt
index 2bea52f..9ec6bd3 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/queue/ResizingArrayQueueTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/queue/ResizingArrayQueueTest.kt
@@ -33,7 +33,7 @@ import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class ResizingArrayQueueTest {
-    private lateinit var queue : ResizingArrayQueue<Int>
+    private lateinit var queue: ResizingArrayQueue<Int>
 
     @BeforeEach
     fun makeQueue() {
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/stack/LinkedListStackTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/stack/LinkedListStackTest.kt
index 9635af4..6414f8a 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/stack/LinkedListStackTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/stack/LinkedListStackTest.kt
@@ -32,7 +32,7 @@ import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class LinkedListStackTest {
-    private lateinit var stack : LinkedListStack<Int>
+    private lateinit var stack: LinkedListStack<Int>
 
     @BeforeEach
     fun init() {
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickFindTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickFindTest.kt
index 986a886..2cd0f1c 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickFindTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickFindTest.kt
@@ -30,7 +30,7 @@ import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class QuickFindTest {
-    private lateinit var unionFind : QuickFind
+    private lateinit var unionFind: QuickFind
 
     @BeforeEach
     fun init() {
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionCompressionPathTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionCompressionPathTest.kt
index 885e31c..7fa840a 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionCompressionPathTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionCompressionPathTest.kt
@@ -30,7 +30,7 @@ import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class QuickUnionCompressionPathTest {
-    private lateinit var unionFind : QuickUnion
+    private lateinit var unionFind: QuickUnion
 
     @BeforeEach
     fun init() {
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionTest.kt
index 1d500b3..8f30fe9 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionTest.kt
@@ -30,7 +30,7 @@ import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class QuickUnionTest {
-    private lateinit var unionFind : QuickUnion
+    private lateinit var unionFind: QuickUnion
 
     @BeforeEach
     fun init() {
diff --git a/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionWithSizeTest.kt b/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionWithSizeTest.kt
index f388811..1065ef4 100644
--- a/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionWithSizeTest.kt
+++ b/src/test/kotlin/it/norangeb/algorithms/datastructures/unionfind/QuickUnionWithSizeTest.kt
@@ -30,7 +30,7 @@ import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class QuickUnionWithSizeTest {
-    private lateinit var unionFind : QuickUnionWithSize
+    private lateinit var unionFind: QuickUnionWithSize
 
     @BeforeEach
     fun init() {