'The best location to implement cd in shell?

I was wondering where is the best location to implement cd? I know that it is definitely not correct if it is implemented in the child process.

    WHILE {

    PROMPT

    A

    fork_return = fork();

    B

    if child { 
        C 
    }

    else if parent { 
        D 
    }
}

I guess its around B or D am I correct?

c shell operating-system

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