completed with the help of leon

src/main/java/io/zipcoder/currencyconverterapplication/CurrencyType.java

@@ -1,5 +1,7 @@
 package io.zipcoder.currencyconverterapplication;
 
+import java.util.Arrays;
+
 public enum CurrencyType {
     AUSTRALIAN_DOLLAR(2.70),
     CANADIAN_DOLLAR(2.64),
@@ -25,6 +27,12 @@ public Double getRate() {
     }
 
     public static CurrencyType getTypeOfCurrency(ConvertableCurrency currency) {
-        return null;
+        return Arrays.asList(CurrencyType.values())
+                .stream()
+                .filter(currencyType -> currencyType.name().replace("_", "")
+                        .equalsIgnoreCase(currency.getClass().getSimpleName()))
+                .findAny()
+                .orElse(null);
+
     }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/AustralianDollar.java

@@ -1,6 +1,17 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class AustralianDollar implements ConvertableCurrency {
+    @Override
+
+
+  public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.AUSTRALIAN_DOLLAR.getRate();
+       return result;
+    }
+
+
+
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/CanadianDollar.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class CanadianDollar implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.CANADIAN_DOLLAR.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/ChineseYR.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class ChineseYR implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.CHINESE_YR.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Euro.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Euro implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.EURO.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Franc.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Franc implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.FRANC.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Pound.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Pound implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.POUND.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Ringgit.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Ringgit implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.RINGGIT.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Rupee.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Rupee implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.RUPEE.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/SingaporeDollar.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class SingaporeDollar implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.SINGAPORE_DOLLAR.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/USDollar.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class USDollar implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.US_DOLLAR.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/UniversalCurrency.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class UniversalCurrency implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.UNIVERSAL_CURRENCY.getRate();
+        return result;
+    }
 }

src/main/java/io/zipcoder/currencyconverterapplication/currencies/Yen.java

@@ -1,6 +1,11 @@
 package io.zipcoder.currencyconverterapplication.currencies;
 
 import io.zipcoder.currencyconverterapplication.ConvertableCurrency;
+import io.zipcoder.currencyconverterapplication.CurrencyType;
 
 public class Yen implements ConvertableCurrency {
+    public  Double convert(CurrencyType currencyType) {
+        Double result= currencyType.getRate()/CurrencyType.YEN.getRate();
+        return result;
+    }
 }