how can i create 4 Process and Piping a message in c Linux?

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

#define MSGSIZE    14 
 
char *message = "hello, world!"; 
 
 
main() { 
char inbuf[MSGSIZE];
int p[3];

pid_t pid;
pid_t pid1;
 
if (pipe(p) == -1){ 
perror("pipe call"); 
exit(1); 
 
}


pid = fork();
pid1 = fork();


if(pid == -1){

perror("Fork failed");
exit(1);

}

if(pid | pid1 == 0)//process A
{
    close(p[0]); 
    write(p[1], message, MSGSIZE);
    read(p[1], message, MSGSIZE);
    write(p[2], message, MSGSIZE);
    
}

/*else if(pid1 == 0){

    close(p[1]);
    //read(p[1], message, MSGSIZE);
    write(p[2], message, MSGSIZE);
    
}*/


else{
    //parent process C
    close(p[2]); 
    read(p[0], inbuf, MSGSIZE);
    printf("Pipelined message return:%s\n", inbuf);
    wait(NULL); 
}

exit(0);
}