I face a functional anomaly during this code execution. what's the problem?

It's the sample code of what I was doing. My intention was to receive an object within a callback but ended up as undefined.

Code:

const a = message => console.log(message);
const b = mes => a(mes);
const c = cb => cb();
const greeting = () => c(() => b("good morning"));
console.log(greeting());

Output: "good morning" undefined