fix malformed query strings

Signed-off-by: kenkosmowski <ken.kosmowski@gmx.de>

Author: kenkosmowski

src/WalletFramework.Oid4Vc/Oid4Vci/Implementations/Oid4VciClientService.cs

@@ -149,7 +149,7 @@ from issState in code.IssuerState
         var authServerMetadata = await FetchAuthorizationServerMetadataAsync(issuerMetadata, offer.CredentialOffer);
 
         var authorizationRequestUri = authServerMetadata.PushedAuthorizationRequestEndpoint.IsNullOrEmpty()
-            ? new Uri(authServerMetadata.AuthorizationEndpoint + "?" + vciAuthorizationRequest.ToQueryString())
+            ? new Uri(authServerMetadata.AuthorizationEndpoint + vciAuthorizationRequest.ToQueryString())
             : await GetRequestUriUsingPushedAuthorizationRequest(authServerMetadata, vciAuthorizationRequest);
 
         var authorizationData = new AuthorizationData(
@@ -211,7 +211,7 @@ public async Task<Uri> InitiateAuthFlow(Uri uri, ClientOptions clientOptions, Op
                     null);
 
                 var authorizationRequestUri = authServerMetadata.PushedAuthorizationRequestEndpoint.IsNullOrEmpty()
-                    ? new Uri(authServerMetadata.AuthorizationEndpoint + "?" + vciAuthorizationRequest.ToQueryString())
+                    ? new Uri(authServerMetadata.AuthorizationEndpoint + vciAuthorizationRequest.ToQueryString())
                     : await GetRequestUriUsingPushedAuthorizationRequest(authServerMetadata, vciAuthorizationRequest);
 
                 //TODO: Select multiple configurationIds