BITCOIN: How come that a solo miner does not contain a wallet function?

Dear Blockgeeks, dear community,
I check the info on bitcoin node types here:

https://www.oreilly.com/library/view/mastering-bitcoin/9781491902639/ch06.html

and it turns out that not all nodes have the wallet function. In which one that is Solo miner node only contains the mining function with a full copied of the blockchain & a bitcoin P2P network routing node. So how can the miner get the block rewards? Where does the system create and send the block rewards to? 
Thank you so much
Crystal