so now, i want to implement a process to create a command named mytime using fork() to run another process, how can i do that

Sure, I can help you with that.

First, let me clarify that `fork()` is a system call that creates a new process by duplicating the calling process. So, in order to create a new process to run the `mytime` command, you need to do the following:

1. Use `fork()` to create a child process.
2. In the child process, use `execvp()` function to execute the `mytime` command.
3. In the parent process, wait for the child process to complete using `waitpid()` function.

Here's a code example:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>

int main() {
    pid_t pid;
    int status;

    pid = fork();
    if (pid == 0) {
        // Child process
        char *args[] = {"mytime", NULL};
        execvp(args[0], args);
        exit(EXIT_FAILURE); // execvp only returns if an error occurs
    } else if (pid < 0) {
        // Error occurred while forking
        fprintf(stderr, "Failed to fork process\n");
        exit(EXIT_FAILURE);
    } else {
        // Parent process
        waitpid(pid, &status, 0);
        printf("Child process exited with status: %d\n", status);
    }

    return 0;
}

In this example, the `fork()` function is used to create a child process. If `fork()` returns a value less than zero, an error occurred and the program exits. If `fork()` returns zero, then we are in the child process and we call `execvp()` to execute the `mytime` command. If `fork()` returns a positive value, then we are in the parent process and we wait for the child process to complete using `waitpid()` function.

I hope this helps! Let me know if you have any questions.