Readind SMS from sim900 gsm module and displaying on LCD using ATmega 128L

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#include <avr/io.h>
#include <lcd.h>
#include <avr/interrupt.h>
#include <stdlib.h>
#include "uart.h"
#include <util/delay.h>
 
#define UART_BAUD_RATE 9600 /* 9600 baud */
#define xtalCpu 7372800
 
unsigned char CtrlZ=0x1A;
 
 
unsigned char msg[] = "";
 
int main(void)
{   
    int k = 0;
    int j = 0;
    int i = 0;
 
    uart_init(UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU));
    sei();
    lcd_init(LCD_DISP_ON);
    
    uart_puts("AT\r\n");
    _delay_ms(3000);
    
    uart_puts("AT+CMGF=1\r\n");//Message format “AT+CMGF=[mode]1” 
 
    _delay_ms(200);
    uart_puts("AT+CMGR=1\r\n");// Read Message
 
    while(uart_getc())
    {
        
        msg[i++]=uart_getc();           
            
    }
    
    i = 0;
 
    while(msg[i++]){
 
        if(msg[i] != '>')
        lcd_putc(msg[i]);
        
    }
 
}

Code C - [expand]
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#include <avr/io.h>
#include <avr/interrupt.h>
#include <lcd.h>
#include <stdlib.h>
#include "uart.h"
#include <util/delay.h>
 
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE ((( F_CPU / ( USART_BAUDRATE * 16 UL ))) - 1)
 
unsigned char msg[] = "";
unsigned int i = 0, j = 0;
 
int main (void)
{
    UCSRB |= (1 << RXEN ) | (1 << TXEN ); // Turn on the transmission and       
 
                //reception circuitry
    UCSRC |= (1 << URSEL ) | (1 << UCSZ0 ) | (1 << UCSZ1 ); // Use 8-bit character 
 
                                //sizes
    UBRRH = ( BAUD_PRESCALE >> 8) ; // Load upper 8-bits of the baud rate value     
 
                //into the high byte
                    //of the UBRR register
    UBRRL = BAUD_PRESCALE; // Load lower 8 -bits of the baud rate value into the    
 
                //low byte of the
                //UBRR register
    sei ()
 
    lcd_init(LCD_DISP_ON);
        uart_puts("AT\r\n");
        _delay_ms(3000);
 
    uart_puts("AT+CMGF=1\r\n");//Message format “AT+CMGF=[mode]1” 
        _delay_ms(200);
        uart_puts("AT+CMGR=1\r\n");// Read Message
    _delay_ms(3000);
    
    for (;;) // Loop forever
    {
        // Do nothing - echoing is handled by the ISR instead of in the main    
 
        //loop
        while(j < 45)
        lcd_putc(msg[j++]);
        j = 0;
        
    }
}
 
 
ISR (USART_RXC_vect)
{
    
    msg[i++] = UDR; // Fetch the received byte value into the variable  
 
            //"ByteReceived"
    msg[i] = '\0';
    if(i == 45) i = 0;      //data length 45 characters.
     
}