Memory segment issues!

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C

I have been tweaking around with tcp code of making client server model. The client will send the name and department where he/she works and server will respond with time at which the input was performed and also the server will write the data from client into a text file. But when i run the code, it sometimes write okay and sometimes mix up the characters from buffer. If anyone can guide, where i have been making mistake, it be great! Here is below the code for client.c and server.c:

client.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include<string.h>
#define MAX 200
#include <netinet/in.h>
int main() {
	
	char request[256] = "Hello I am Client are you there";
	char buf[MAX];
	
	// create the socket
	int sock;
	sock = socket(AF_INET, SOCK_STREAM, 0);
	
	//setup an address
	struct sockaddr_in server_address;
	server_address.sin_family = AF_INET;
	server_address.sin_addr.s_addr = INADDR_ANY;
	server_address.sin_port = htons(3001);

	connect(sock, (struct sockaddr *) &server_address, sizeof(server_address));
	
	//send(sock, request, sizeof(request), 0);
	//recv(sock, &buf, sizeof(buf), 0);
	//printf("\n %s \n", buf);

	int i,n; 
        for (i=0;i<10;i++) 
	{ 
        printf("TIME IN : "); 
        n = 0; 
        while ((buf[n++] = getchar()) != '\n') 
            ; 
        write(sock, buf, sizeof(buf)); 
        
        if ((strncmp(buf, "exit", 4)) == 0) { 
            printf("Client exiting...\n"); 
            break; 
        } 
	read(sock, buf, sizeof(buf)); 
	if ((strncmp(buf, "exit", 4)) == 0) { 
            printf("Client exiting...\n"); 
            break; 
        } 
        printf("From Server : %s \n", buf); 
    } 
	close(sock);

	return 0;
}

////////////////////////////////////////////////////////////////////////////////
server.c

#include <stdio.h>
#include <stdlib.h>
#include<string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include<time.h>
#include <netinet/in.h>
#define MAX 200
int main() {
	// creating file pointer to work with files
        FILE *fptr;

        // opening file in writing mode
        fptr = fopen("program.txt", "w");

	char server_message[256] = "Hi, Yes you have reached the server!";
	char buf[MAX];
	// create the server socket
	int server_socket;
	server_socket = socket(AF_INET, SOCK_STREAM, 0);

	
	// define the server address
	struct sockaddr_in server_address;
	server_address.sin_family = AF_INET;
	server_address.sin_port = htons(3001);
	server_address.sin_addr.s_addr = INADDR_ANY;

	// bind the socket to our specified IP and port
	bind(server_socket, (struct sockaddr*) &server_address, sizeof(server_address));
	listen(server_socket, 5);
	int client_socket;
	client_socket = accept(server_socket, NULL, NULL);
	int n; 
    
        for (n=0;n<10;n++) { 
         
  
        bzero(buf,MAX);
        read(client_socket, buf, sizeof(buf)); 
	if (strncmp("exit", buf, 4) == 0) { 
            printf("Server Exit...\n"); 
            break; 
        } 
        
        printf("Time Sequence: %s\t", buf); 
	fprintf(fptr,"%s", buf);
	bzero(buf,MAX);
        time_t current_time = time(NULL);
        struct tm *tm = localtime(¤t_time);
        strftime(buf, sizeof(buf), "%c", tm); 
       
  
      
        write(client_socket, buf, sizeof(buf)); 
  
       
        if (strncmp("exit", buf, 4) == 0) { 
            printf("Server exiting...\n"); 
            break; 
        } 
    } 

	fclose(fptr);

	// close the socket
	close(server_socket);
	
	return 0;
}

What I have tried:

i have tried to empty the buffer variable but so far no results!