wave passed

src/main/java/rocks/zipcode/io/quiz3/arrays/WaveGenerator.java

 package rocks.zipcode.io.quiz3.arrays;
 
+import java.util.ArrayList;
+
 /**
  * @author leon on 09/12/2018.
  */
 public class WaveGenerator {
     public static String[] wave(String str) {
-        return null;
+        str = str.toLowerCase();
+        ArrayList<String> result = new ArrayList<>();
+        for (int i = 0; i < str.length(); i++) {
+            if(str.charAt(i) >= 97 && str.charAt(i) <= 122){
+                result.add(str.substring(0,i) + (str.substring(i,i+1).toUpperCase()) + str.substring(i+1));
+            }
+        }
+        return result.toArray(new String[0]);
     }
 }