fix checkstyle errors

trampoline/src/main/java/com/iluwatar/trampoline/Trampoline.java

@@ -2,14 +2,16 @@ package com.iluwatar.trampoline;
 
 import java.util.stream.Stream;
 
-/**<p>Trampoline pattern allows to define recursive algorithms by iterative loop </p>
+/**
+ * <p>Trampoline pattern allows to define recursive algorithms by iterative loop </p>
  * <p>When get is called on the returned Trampoline, internally it will iterate calling ‘jump’
- on the returned Trampoline as long as the concrete instance returned is {@link #more(Trampoline)},
- stopping once the returned instance is {@link #done(Object)}.</p>
- <p>Essential we convert looping via recursion into iteration,
- the key enabling mechanism is the fact that {@link #more(Trampoline)} is a lazy operation.</p>
+ * on the returned Trampoline as long as the concrete instance returned is {@link #more(Trampoline)},
+ * stopping once the returned instance is {@link #done(Object)}.</p>
+ * <p>Essential we convert looping via recursion into iteration,
+ * the key enabling mechanism is the fact that {@link #more(Trampoline)} is a lazy operation.</p>
+ *
+ * @param <T> is  type for returning result.
  */
-
 public interface Trampoline<T> {
   T get();
 
@@ -28,7 +30,6 @@ public interface Trampoline<T>  {
 
   /**
    * @return true if complete
-     *
    */
   default boolean complete() {
     return true;

trampoline/src/main/java/com/iluwatar/trampoline/TrampolineApp.java

@@ -31,9 +31,12 @@ import lombok.extern.slf4j.Slf4j;
  * <p>it is possible to implement algorithms recursively in Java without blowing the stack
  * and to interleave the execution of functions without hard coding them together or even using threads.</p>
  */
-
 @Slf4j
 public class TrampolineApp {
+
+  /**
+   * Main program for showing pattern. It does loop with factorial function.
+   * */
   public static void main(String[] args) {
     log.info("start pattern");
     Integer result = loop(10, 1).result();
@@ -43,12 +46,13 @@ public class TrampolineApp {
 
   /**
    * Manager for pattern. Define it with a factorial function.
-     * */
+   */
   public static Trampoline<Integer> loop(int times, int prod) {
-        if (times == 0)
+    if (times == 0) {
       return Trampoline.done(prod);
-        else
+    } else {
       return Trampoline.more(() -> loop(times - 1, prod * times));
     }
+  }
 
 }

trampoline/src/test/java/com/iluwatar/trampoline/TrampolineAppTest.java

@@ -6,6 +6,10 @@ import java.io.IOException;
 
 import static org.junit.Assert.*;
 
+
+/**
+ * Test for trampoline pattern.
+ * */
 public class TrampolineAppTest {