corrected code style

Author: Sprokof

src/main/java/com/amadeus/Params.java

@@ -49,12 +49,12 @@ public static Params with(@NonNull String key, Object value) {
    * @return the Param object, allowing for convenient chaining
    */
   public Params and(@NonNull String key, Object value) {
-    if(value instanceof List){
+    if(value instanceof List) {
       @SuppressWarnings("unchecked") List<String> values = (List<String>) value;
       put(key, String.join(",", values));
-      return this;
+    } else {
+      put(key, String.valueOf(value));
     }
-    put(key, String.valueOf(value));
     return this;
   }
 

src/test/java/com/amadeus/ParamsTest.java

@@ -5,7 +5,7 @@
 
 import org.junit.jupiter.api.Test;
 
-import java.util.List;
+import java.util.Arrays;
 
 public class ParamsTest {
   /**
@@ -24,8 +24,8 @@ public class ParamsTest {
     assertEquals(params.toQueryString(), "bar=234&foo=123");
   }
 
-  @Test public void testToQueryStringWithList(){
-    Params params = Params.with("foo", List.of("id1", "id2"));
+  @Test public void testToQueryStringWithList() {
+    Params params = Params.with("foo", Arrays.asList("id1", "id2"));
     assertEquals(params.toQueryString(), "foo=id1%2Cid2");
   }