money

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

@@ -2,6 +2,6 @@
 
 public interface ConvertableCurrency {
     default Double convert(CurrencyType currencyType) {
-        return Double.MAX_VALUE;
+        return (currencyType.getRate() / currencyType.getTypeOfCurrency(this).getRate());
     }
 }

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

@@ -25,6 +25,15 @@ public Double getRate() {
     }
 
     public static CurrencyType getTypeOfCurrency(ConvertableCurrency currency) {
+        for (CurrencyType value : CurrencyType.values()){
+            String oldMoney = value.name().replace( "_", "" );
+            String newMoney = currency.getClass().getSimpleName();
+
+            if (oldMoney.equalsIgnoreCase(newMoney)) {
+                return value;
+            }
+        }
+
         return null;
     }
 }