message: chore(issuer): Internal/external function and variable names
diff: @@ -32,7 +32,7 @@ contract Issuer is Initializable, OwnableUpgradeable, UUPSUpgradeable {
  mapping(uint256 => CertificationRequest) private _certificationRequests;
  // Mapping from request ID to certificate ID
  - mapping(uint256 => uint256) private requestToCertificate;
  + mapping(uint256 => uint256) private _requestToCertificate;
  // Incrementing nonce, used for generating certification request IDs
  uint256 private _latestCertificationRequestId;
  @@ -159,7 +159,7 @@ contract Issuer is Initializable, OwnableUpgradeable, UUPSUpgradeable {
  request.data
  );
  - requestToCertificate[_requestId] = certificateId;
  + _requestToCertificate[_requestId] = certificateId;
  emit CertificationRequestApproved(request.owner, _requestId, certificateId);
  @@ -201,7 +201,7 @@ contract Issuer is Initializable, OwnableUpgradeable, UUPSUpgradeable {
  );
  for (uint256 i = 0; i < _requestIds.length; i++) {
  - requestToCertificate[_requestIds[i]] = certificateIds[i];
  + _requestToCertificate[_requestIds[i]] = certificateIds[i];
  }
  emit CertificationRequestBatchApproved(owners, _requestIds, certificateIds);
  @@ -249,7 +249,7 @@ contract Issuer is Initializable, OwnableUpgradeable, UUPSUpgradeable {
  require(_requestId <= _latestCertificationRequestId, "Issuer::isRequestValid: certification request ID out of bounds");
  CertificationRequest memory request = _certificationRequests[_requestId];
  - uint256 certificateId = requestToCertificate[_requestId];
  + uint256 certificateId = _requestToCertificate[_requestId];
  return request.approved
  && !request.revoked
  