code: func IsTLSCert(block string) bool {
  	var cert tls.Certificate
  
  	pemBlock := []byte(block)
  
  	for {
  		var derBlock *pem.Block
  		derBlock, pemBlock = pem.Decode(pemBlock)
  		if derBlock == nil {
  			break
  		}
  
  		if derBlock.Type == certificate {
  			cert.Certificate =
  				append(cert.Certificate, derBlock.Bytes)
  		}
  	}
  
  	if len(cert.Certificate) == 0 {
  		return false
  	}
  
  	return true
  }
docs: // IsTLSCert if block is one or more
  // TLS certificates then function returns true