message: commit changes before merging
diff: //15. Issuer create XYZ Claim
  NSString *xyzClaimJson = [[AnoncredsUtils sharedInstance] getXyzClaimJson];
  -#if 0
  - //15. Issuer create XYZ Claim
  - let xyz_claim_json = AnoncredsUtils::get_xyz_claim_json();
  - let res = AnoncredsUtils::issuer_create_claim(issuer_xyz_wallet_handle,
  - &xyz_claim_req,
  - &xyz_claim_json);
  - assert!(res.is_ok());
  - let (revoc_reg_update_json, xyz_claim_json) = res.unwrap();
  + res = [[AnoncredsUtils sharedInstance] issuerCreateClaim: issuerXyzWalletHandle
  + claimReqJson: xyzClaimReq
  + claimJson: xyzClaimJson
  + outRevocRegUpdateJSON:&revocRegUpdateJson
  + outClaimJson:&xyzClaimJson];
  +
  + XCTAssertEqual(res.code, Success, @"AnoncredsUtils::issuerCreateClaim() failed");
  // 16. Prover store received XYZ Claim
  - let res = AnoncredsUtils::prover_store_claim(prover_wallet_handle, &xyz_claim_json);
  - assert!(res.is_ok());
  + res = [[AnoncredsUtils sharedInstance] proverStoreClaim:proverWalletHandle
  + claimsJson:xyzClaimJson];
  +
  + XCTAssertEqual(res.code, Success, @"AnoncredsUtils::proverStoreClaim() failed");
  +
  // 17. Prover gets Claims for Proof Request
  +
  + NSString *proofReqJson =[ NSString stringWithFormat:@"{"\
  + " \"nonce\":\"123432421212\","\
  + " \"requested_attrs\":"\
  + " {\"attr1_uuid\":"\
  + " {"\
  + " \"schema_seq_no\":%ld,\"name\":\"name\""\
  + " },"\
  + " \"attr2_uuid\":"\
  + " {"\
  + " \"schema_seq_no\":%ld,\"name\":\"status\""\
  + " }"\
  + " },"\
  + " \"requested_predicates\":"\
  + " {"\
  + " \"predicate1_uuid\":"\
  + " {\"attr_name\":\"age\",\"p_type\":\"GE\",\"value\":18},"\
  + " \"predicate2_uuid\":"\
  + " {\"attr_name\":\"period\",\"p_type\":\"GE\",\"value\":5}"\
  + " }"\
  + "}", [gvtSchemaSeqNo integerValue], [xyzSchemaSeqNo integerValue] ];
  +
  + NSString *claimsJson = nil;
  +
  + res = [[AnoncredsUtils sharedInstance] proverGetClaimsForProofReq: proverWalletHandle
  + proofRequestJson: proofReqJson
  + outClaimsJson:&claimsJson];
  +
  + XCTAssertEqual(res.code, Success, @"AnoncredsUtils::proverGetClaimsForProofReq() failed");
  +
  + NSDictionary *claims = [ NSDictionary fromString: claimsJson];
  + XCTAssertTrue(claims, @"serialization failed");
  +
  + NSDictionary *claimsForPredicates1 = [[ [claims objectForKey: @"predicates" ] objectForKey: @"predicate1_uuid"] objectAtIndex: 0 ];
  + NSDictionary *claimsForPredicates2 = [[ [claims objectForKey: @"predicates" ] objectForKey: @"predicate2_uuid"] objectAtIndex: 0 ];
  +
  + XCTAssertTrue( claimsForPredicates1, @"no object for key \"attr1_uuid\"");
  + XCTAssertTrue( claimsForPredicates2, @"no object for key \"attr2_uuid\"");
  +
  + NSString *claimUUID = [claims_for_attr_1 objectForKey:@"claim_uuid"];
  +
  +
  +#if 0
  +
  let proof_req_json = format!("{{\
  \"nonce\":\"123432421212\",\
  \"requested_attrs\":{{\"attr1_uuid\":{{\"schema_seq_no\":{},\"name\":\"name\"}},\
  