How public key is calculated from a base58 encoded private key?

How public key is calculated from a base58 encoded private key?

I followed this post and created a private key for bitcoin wallet. The post says after finding the random 256 bit(32 bytes) integer the version number should be prepended and the checksum should be appended to it. This produces a 37 bytes hex. Now I am trying to find the public key associated with this private key.I learnt that the PUBLIC key is calculated by applying ECDSA secp256k1 curve on the private key. But only 32 bytes is accepted as input by the ECDSA algorithm.
So what am I doing wrong?
Thanks in advance.

http://bit.ly/2AvHLvg

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