[AVR] gsm sim300 interfacing with atmega32

int main(void)
{
    
    
    
    int i,timeout=0;
    unsigned char box, message[47], no[14], abc[20];
    unsigned char *data;
    unsigned char *code = "Temp";
    unsigned char gotit[5];
    
    
    
    
    
    UART_Init();
    ADCSRA |= 1<<ADEN;
    ADCSRA |= 1<<ADPS2;
    ADMUX=0x40;
    ADCSRA |= 1<<ADIE;
    
    
    sei();
    
    ADCSRA |= 1<<ADSC;
    
    
    
    while(1)
    {
    i=0;
    while(i<8)
            {
                box=UART_Receive();
            abc[i]=box;
            i++;
            }
    
    
    while(abc[6]=='I')
    {
        
            UART_Transmit_string("ATE0\r\n");
            _delay_ms(1000);
            UART_Transmit_string("AT\r\n");
            _delay_ms(1000);
            UART_Transmit_string("AT+CMGF=1;\r\n");
            _delay_ms(1000);
        
                UART_Transmit_string("AT+CMGR=1;\r\n");
            _delay_ms(1000);
    
            while((UART_Receive()!=',')&&(timeout<100000))
            {
                timeout++;
            }
            timeout=0;
        
            for(i=0;i<48;i++)
            {
                box=UART_Receive();
                message[i]=box;
        
            }
        
        
            for(i=1;i<14;i++)
            {
                no[i-1]=message[i];
            }
        
        
            data = strstr(message, code);
            for(i=0;i<4;i++)
            {
                gotit[i]=data[i];
            }
                
            if ( strcmp(gotit, code) == 0 )
                      
            {
                 
                //UART_Transmit_string("AT\r\n");
                //_delay_ms(40);
                //UART_Transmit_string("AT+CMGF=1;\r\n");
                //_delay_ms(40);
                UART_Transmit_string("AT+CMGS=\"");
                UART_Transmit_string(no);
                UART_Transmit_string("\"\r\n");
                _delay_ms(200); 
                UART_Transmit_string("coming");
                UART_Transmit_string("\r\n");
                _delay_ms(500);
                uart_transmitchar(0x1A);
                _delay_ms(200);
            }
             else
      
      
            {
                UART_Transmit_string("AT\r\n");
                _delay_ms(1000);
                UART_Transmit_string("AT+CMGF=1;\r\n");
                _delay_ms(1000);
                UART_Transmit_string("AT+CMGS=\"");
                UART_Transmit_string(no);
                UART_Transmit_string("\"\r\n"); 
                UART_Transmit_string("u r nt authorised");
                UART_Transmit_string("\r\n");
                _delay_ms(500);
                uart_transmitchar(0x1A);
                _delay_ms(200);
            }
            
            UART_Transmit_string("AT+CMGD=1;\r\n");
            _delay_ms(1000);
            
      
            memset( abc, '\0', sizeof(abc) );
            memset( message, 0, sizeof(message) );
            memset( gotit, 0, sizeof(gotit) );
             memset( no, 0, sizeof(no) );
             memset( data, 0, sizeof(data) );
            _delay_ms(2000);
        }
            
    }
    }

{
while(!(UCSRA & (1 << RXC)));
       return UDR; 
}