Apex domains cannot have CNAME records.
Question and response
Question
dig hakanzengin.com. NS
Answer
hakanzengin.com. 4 NS ns-865.awsdns-44.net.
hakanzengin.com. 4 NS ns-1313.awsdns-36.org.
hakanzengin.com. 4 NS ns-1174.awsdns-18.org.
hakanzengin.com. 4 NS ns-1684.awsdns-18.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0