Help me to Filter string in UART + Codevision

#define MAXCHAR 40
#define CR 13
char int_buff[MAXCHAR];

void check_SMS()//Check SMS sends case
{

unsigned int i;//Create int var
char content[10];//create array has 10 character
i=0;//set i=0
int_buff[0]='+';//create array int_buff[0] starts from "+"

while((i<MAXCHAR) && (rx_counter>0))//
{
if((int_buff[i++]=UDR)==CR) break;//The program stops when UDR=int_buff=CR, CR is enter key and equal 13 in ASCII.
delay_ms(500);
}
if(rx_counter==0)//if rx_counter=0, transmit is finished
{
strcpy(content,&int_buff[i]);//Copy data from int_buff to content
puts(content);
lcd_gotoxy(0,0);
lcd_puts(content);//Print it to LCD
delay_ms(500);
}

i=0;
	for (;;)
	{	abcce:
		usart_buff[i]=USART0_Receive();
		if(usart_buff[i]=='+')
		{
			
			usart_buff[i]=USART0_Receive();
			if(usart_buff[i]=='C')
			{
				usart_buff[i]=USART0_Receive();
				if(usart_buff[i]=='L')
				{
					do{
					
					usart_buff[i]=USART0_Receive();
					}
					while (usart_buff[i]!=':');
					USART0_Receive();
					//USART0_Receive(); 
					USART0_Receive();
					//do{
					i=7;
					for (int d=0;d<8;d++)
					numb[i--]=USART0_Receive();
					//}
					//while(numb[i]!=',');
										USART0_TransmitString("\r ATH\r");
										_delay_ms(250);
										
					numb[8]='\0';
					

					//USART0_TransmitString(numb);
					
					if(strncmp(numb,sm,8)==0)
					USART0_TransmitString("switch on");
					
				 	else if(match_mstr()==1)
					USART0_TransmitString("switch on");

					else if(match_user()==1)
					USART0_TransmitString("switch on");
				
					
					goto abcce;	
				}
				else if (usart_buff[i]=='M')
				{
					usart_buff[i]=USART0_Receive();
					if(usart_buff[i]=='T')	
					{
						for(int d=0;d<8;d++)
						{
							USART0_Receive();
						}
						i=0;
						index[0]=USART0_Receive();
						index[1]=USART0_Receive();
						
						//USART0_TransmitString("\r index :  \r");
						//USART0_TransmitString(index);
						//	USART0_Transmit('\r');
					//	index[]="02";
						USART0_TransmitString("AT+CMGR=");
						USART0_TransmitString(index);	
						USART0_Transmit('\r');

						
						while(USART0_Receive()!=',');
						
						USART0_Receive();
						USART0_Receive();
						USART0_Receive();
						USART0_Receive();
						USART0_Receive();
						
						i=7;
						//while(numb[i]!=0x0d)
						for (int d=0;d<8;d++)
						{
							numb[i--]=USART0_Receive();
						}
						//
						USART0_TransmitString(numb);
						USART0_TransmitString("\r");	
	

						int w=0;
						while(USART0_Receive()!=0x0d);
						
						w=-1;
						msg[-1]=USART0_Receive();
						while(msg[w]!=0x0d)
						{
							msg[++w]=USART0_Receive();
							//w++;
						}
						msg[w]='\0';
							
						USART0_TransmitString("\r at+cmgd=1,4\r");
	
						USART0_TransmitString(msg);
						//char chr[5];