produce a public key from private key with ecc, with clear description about k=k*g According to this answer: https://bitcoin.stackexchange.com/a/63996/100526
When he wants to generate a public key from the private key, he has used K=k*G. but I can't understand it's result.
If we assume our private key is (according to the answer) :

0F479245FB19A38A1954C5C7C0EBAB2F9BDFD96A17563EF28A6A4B1A2A764EF4


and according to Secp256k1 G point is:

- Compressed form (prefix 02)
02 79BE667E F9DCBBAC 55A06295 CE870B07 029BFCDB 2DCE28D9 59F2815B 16F81798 

 - Uncompressed form (prefix 04)
04 79BE667E F9DCBBAC 55A06295 CE870B07 029BFCDB 2DCE28D9 59F2815B 16F81798
483ADA77 26A3C465 5DA4FBFC 0E1108A8 FD17B448 A6855419 9C47D08F FB10D4B8 


So to calculate the public key I used this site: https://www.boxentriq.com/code-breaking/big-number-calculator 

I used compressed form and private key:
0279BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798  *  0F479245FB19A38A1954C5C7C0EBAB2F9BDFD96A17563EF28A6A4B1A2A764EF4

and result is :

25d355ebb23e6ce0fd5463bf40e6da2ccc4e2e8ce654db6a8a8e5a275f0d2266005569112cfda60d14f9b6d0c0218cc072047a3b2fcf97aee95a437b4bb6cce0


but in that answer the result is :

02E8445082A72F29B75CA48748A914DF60622A609CACFCE8ED0E35804560741D29


what's wrong?
When talking about math using a curve, when we use terms like addition and multiplication, we don't mean normal additional and multiplication. We are referring to operations on the curve that have properties similar to addition and multiplication. To get the correct results, you have to use the actual operations on the curve, not normal addition and multiplication.