public ChallengeController(IChallengeHandler handler)
 {
     _handler = handler;
 }
 public ChallengesController(IChallengeHandler _ch)
 {
     this.ChallengeHandler = _ch;
 }
 public ChallengeController(IChallengeHandler handler, ILog log)
 {
     _handler = handler;
     _log     = log;
 }
 public ChallengeController(IChallengeHandler challengeHandler, ILogger <ChallengeController> logger)
 {
     _challengeHandler = challengeHandler;
     _logger           = logger;
 }