Added URL encoding to group name in isMemberOf call

package it.inaf.ia2.transfer.auth;

import java.net.URLEncoder;

import java.nio.charset.StandardCharsets;

import java.util.Collections;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.cache.annotation.Cacheable;

@Component

public class GmsClient {

    private static final Logger LOG = LoggerFactory.getLogger(GmsClient.class);

    @Value("${gms_base_url}")

    private String gmsBaseUrl;

    @Cacheable("gms_cache")

    public boolean isMemberOf(String token, String group) {

        String url = gmsBaseUrl + "/vo/search/" + group;

        LOG.trace("called isMemberOf for group " + group);

        String url = gmsBaseUrl + "/vo/search/" + URLEncoder.encode(group, StandardCharsets.UTF_8);

        String gmsResponse = restTemplate.exchange(url, HttpMethod.GET, getEntity(token), String.class).getBody();

        if (gmsResponse == null) {