well

src/main/java/io/zipcoder/microlabs/mastering_loops/NumberUtilities.java

 
 public class NumberUtilities {
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        StringBuilder even = new StringBuilder();
+        for (int i = start; i < stop; i++) {
+            if (i % 2 == 0) {
+                even.append(i);
+            }
+
+        }
+        return even.toString();
     }
 
 
     public static String getOddNumbers(int start, int stop) {
-        return null;
-    }
+        StringBuilder odd = new StringBuilder();
+        for (int i = start; i < stop; i++) {
+            if (i % 2 == 0) {
+                odd.append(i);
+            }
+
+        }
+        return odd.toString();
 
 
+    }
+
     public static String getSquareNumbers(int start, int stop, int step) {
-        return null;
+        StringBuilder squared = new StringBuilder();
+        for (int i = start; i < stop; i += step) {
+
+            squared.append(i * i);
+
+
+        }
+
+        return squared.toString();
+
     }
 
     public static String getRange(int start) {
+
         return null;
+
     }
 
     public static String getRange(int start, int stop) {
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+        StringBuilder rangeNum = new StringBuilder();
+        for (int i = start; i < stop; i += step) {
+
+                rangeNum.append(i);
+
+
+        }
+        return rangeNum.toString();
+
     }