fix amount field to correct errorMessages in createDto

remove unused class

Author: FaridQuluzada

src/main/java/az/unitech/development/exchange/MsExchangeApplication.java

@@ -10,4 +10,4 @@ public static void main(String[] args) {
         SpringApplication.run(MsExchangeApplication.class, args);
     }
 
-}
+}

src/main/java/az/unitech/development/exchange/controller/ExchangeController.java

@@ -22,4 +22,4 @@ public ExchangeResponse calculate(@Valid ExchangeRequest exchangeRequest) {
         return exchangeService.calculate(exchangeRequest);
     }
 
-}
+}

src/main/java/az/unitech/development/exchange/dto/request/ExchangeRequest.java

@@ -13,7 +13,7 @@ public class ExchangeRequest {
     @Currency
     private String from;
 
-    @Positive(message = ErrorMessages.INVALID_CURRENCY)
+    @Positive(message = ErrorMessages.INVALID_AMOUNT)
     private BigDecimal amount;
 
     @Currency

src/main/java/az/unitech/development/exchange/error/ErrorCodes.java

@@ -10,4 +10,4 @@ api:
     io: https://api.fastforex.io
     apiKey: e1f04a0af8-e18634ec89-r8xxb8
 server:
-  port: 8081
+  port: 8081