Add more cases to convert currency to YEN and YUAN

src/currencyExchange.c

@@ -7,6 +7,13 @@ float convert(float euro, int newCurrencyCode) {
 
         case CURRENCY_CODE_GBP:
             return ( euro * GBP_RATE_OF_ONE_EURO );
+
+        case CURRENCY_CODE_JAPANESE_YEN:
+            return ( euro * JAPANESE_YEN_RATE_OF_ONE_EURO );
+
+        case CURRENCY_CODE_CHINESE_YUAN:
+            return ( euro * CHINESE_YUAN_RATE_OF_ONE_EURO );
+
     }
     
     return -1;