Updated TableUtilitiies Methods

TableUtilities.java

 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+        return getMultiplicationTable(5);
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        return getMultiplicationTable(10);
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+        StringBuilder multiTable = new StringBuilder();
+        // nested for loop
+        for (int i = 1; i <= tableSize; i++) {
+            for (int j = 1; j <= tableSize; j++) {
+                multiTable.append(String.format("%3d |", i * j));
+            }
+            multiTable.append("\n");
+        }
+        return multiTable.toString();
     }
 }