fix: ensure valid block explorer URL for address links

Author: joaquim-verges

apps/dashboard/src/components/custom-contract/contract-header/metadata-header.tsx

@@ -117,7 +117,7 @@ export const MetadataHeader: React.FC<MetadataHeaderProps> = ({
             <BadgeLink
               key={validBlockExplorer.url}
               name={validBlockExplorer.name}
-              href={`${validBlockExplorer.url}/address/${address}`}
+              href={`${validBlockExplorer.url.endsWith("/") ? validBlockExplorer.url : `${validBlockExplorer.url}/`}address/${address}`}
             />
           ))}