problem with rtc clock in lcd display with pic16f877a

// lcd header file
Lcd_Init();
Lcd_data(unsigned char,unsigned char );
Lcd_Display(unsigned char ,char const *);
set_delay(unsigned char ,unsigned int );
Lcd_Decimal(unsigned char ,unsigned int ,unsigned char );
Lcd_write(unsigned char ,unsigned char );

#define rs RD0
#define en RD1

#define dat_port PORTD

Lcd_Init()
{	
	
	Lcd_data(0x02,0);
	Lcd_data(0x28,0);
	Lcd_data(0x0c,0);
	Lcd_data(0x06,0);
	Lcd_data(0x01,0);

}

Lcd_data(unsigned char x,unsigned char y)
{
	unsigned char a,b,t;
	a=  x & 0xf0;
	b= (x<<4) & 0xf0;
	
	t=dat_port & 0x0f;
	dat_port=a|t;
	rs=y;
	en=1;set_delay(1,250);
	en=0;

	t=dat_port & 0x0f;
	dat_port=b|t;
	rs=y;
	en=1;set_delay(1,250);
	en=0;	
}
Lcd_write(unsigned char x,unsigned char y)
{
	Lcd_data(x,0);//command_mode
	Lcd_data(y,1);//data_mode
}

Lcd_Display(unsigned char x,char const *y)
{
	Lcd_data(x,0); //command mode
	while(*y!='\0')Lcd_data(*y++,1); //data mode
}
Lcd_Decimal(unsigned char x,unsigned int y,unsigned char n)
{
	Lcd_data(x,0);
	unsigned int m=1;
	while(n--)m=m*10;
	while(m>1)
	{
		Lcd_data((y%m)/(m/10)+0x30 , 1);
		m=m/10;
	}

}

set_delay(unsigned char x,unsigned int y)
{
	while(x--)while(y--);
}

//rtc header file
#define sda_dir TRISC4
#define scl_dir TRISC3

#define i2c_sp 100 //kbps  
#define xtal_freq 4000000

i2c_init();
i2c_start();
i2c_stop();
i2c_write_byte(unsigned char );
unsigned char i2c_read_byte();
i2c_restart();
set_time(unsigned char ,unsigned char ,unsigned char ,unsigned char );
get_time(unsigned char );
#define sda_dir TRISC4
#define scl_dir TRISC3

#define i2c_sp 100   
#define xtal_freq 4000000

i2c_init();
i2c_start();
i2c_stop();
i2c_write_byte(unsigned char );
unsigned char i2c_read_byte();
i2c_restart();
set_time(unsigned char ,unsigned char ,unsigned char ,unsigned char );
get_time(unsigned char );

i2c_init()
{
	sda_dir=1;
	scl_dir=1;

	SSPADD=((xtal_freq/4000)/i2c_sp)-1;
	SSPSTAT=0x80; 
	SSPCON=0x28;
}

i2c_start()
{
	SEN=1;
	while(!SSPIF);
	SSPIF=0;
}
i2c_stop()
{
	PEN=1;
	while(!SSPIF);
	SSPIF=0;
}
i2c_restart()
{
	RSEN=1;
	while(!SSPIF);
	SSPIF=0;
}
i2c_write_byte(unsigned char x)
{

	SSPBUF=x;
	while(!SSPIF);
	SSPIF=0;
	while(ACKSTAT);
}

unsigned char i2c_read_byte()
{
	RCEN=1;
	while(!SSPIF);
	SSPIF=0;
	return SSPBUF;
}

set_time(unsigned char loc,unsigned char a,unsigned char b,unsigned char c)
{
	i2c_start();
	i2c_write_byte(0xd0);
	i2c_write_byte(loc);
	
	i2c_write_byte(a);i2c_write_byte(b);i2c_write_byte(c);

	i2c_stop();
}

get_time(unsigned char loc)
{
	unsigned char v,i,j,k;
	i2c_start();
	i2c_write_byte(0xd0);
	i2c_write_byte(loc);

	i2c_restart();
	i2c_write_byte(0xd1);
	v=i2c_read_byte();
	i2c_stop();
		
	i=(v>>4)&0x0f;
	j= v & 0x0f;
	k=i*10+j;
	return(k);
}

#include<pic.h>
#include"pic_lcd.h"
#include"rtc.h"


unsigned char i,x[]={0x80,0x87,0x8d,0,0xc0,0xc7,0xcd},b;


main()
{
	TRISD=0x00;
	Lcd_Init();
	Lcd_Display(0x80,"----------------");
	Lcd_Display(0xc0,"----------------");
	i2c_init();
	set_time(0,0x15,0x30,0x00);set_delay(1,10);
	set_time(4,0x22,0x06,0x11);set_delay(1,10);
	while(1)
	{
		for(i=0;i<7;i++)
		{
			if(i==3)continue;
			b=get_time(i);
			Lcd_Decimal(x[i],b,2);
			set_delay(1,25);
		}
	}			
}