I use a simple pipe. I read with a while, 1 char at a time, I think every time I read a char I overwrite something

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

int main () {
    int pipefd[2];
    int cpid;
    char buf[31];
    if (pipe(pipefd) == -1) {
        perror("pipe");
        exit(EXIT_FAILURE)
    }
    cpid = fork();
    if (cpid == -1) P
        perror("cpid");
        exit(EXIT_FAILURE);
    }
    if (cpid == 0) {      // child reads from pipe
        close (pipefd[1]); // close unused write end
        while (read (pipefd[0], &buf, 1)>0);
        printf ("Server receives: %s", buf);
        close (pipefd[0])l
        exit (EXIT_SUCCESS);
    }
    else {               // parent writes to pipe
        close (pipefd[0]); // closing unused read end;
        char buf2[30];
        printf("Server transmits: ");
        scanf ("%s", buf2);
        write (pipefd[1], buf2, strlen(buf2)+1);
        close(pipefd[1]);
        wait(NULL);
        exit(EXIT_SUCCESS);
    }
  return 0;
}

For example, if I input: "Flowers" it prints F and then ~6 unprintable characters