AVR Freaks

I have a simple project. I have an ATmega32 connected to a 16x2 LCD and a DS13027 chip. I am using 8-Bit data with the 16x2 LCD. Below is the code.

#define F_CPU 8000000UL

#define LCD_DPRT  PORTA
#define LCD_DDDR  DDRA
#define LCD_DPIN  PINA
#define LCD_CPRT  PORTB
#define LCD_CDDR  DDRB
#define LCD_CPIN  PINB
#define LCD_RS  0
#define LCD_RW  1
#define LCD_EN  2

#include <avr/io.h>
#include <util/delay.h>

void i2c_stop(void);
void i2c_write(unsigned char data);
void i2c_start(void);
void i2c_init(void);
unsigned char i2c_read(unsigned char ackVal);
void rtc_init(void);
void rtc_setTime(unsigned char deviceRegister, unsigned char value);
unsigned char *rtc_getTime(unsigned char deviceRegister);
void lcdCommand( unsigned char cmnd );
void lcdData( unsigned char data );
void lcd_init();
void lcd_gotoxy(unsigned char x, unsigned char y);
void lcd_print( const char * str );

int main(void) {

    unsigned char *hours;

    rtc_init();
    rtc_setTime(0x02, 0x22);

    hours = rtc_getTime(0x02);

    lcd_init();
    lcd_gotoxy(1,1);
    lcd_print(hours[0]);
    lcd_gotoxy(2,1);
    lcd_print(hours[1]);

    while (1);
    return 0;
}

void i2c_stop(void){
    TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
}

void i2c_write(unsigned char data){
    TWDR = data;
    TWCR = (1<<TWINT) | (1<<TWEN);
    while(!(TWCR & (1<<TWINT)));
}

void i2c_start(void){
    TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
    while(!(TWCR & (1<<TWINT)));
}

void i2c_init(void){
    TWSR = 0x00;
    TWBR = 0x47;
    TWCR = 0x04;
}

unsigned char i2c_read(unsigned char ackVal){
    TWCR = (1<<TWINT) | (1<<TWEN) | (ackVal<<TWEA);
    while( !( TWCR & (1<<TWINT)) );
    return TWDR;
}

void rtc_init(void){
    i2c_init();
    i2c_start();
    i2c_write(0xD0);
    i2c_write(0x07);
    i2c_write(0x00);
    i2c_stop();
}

void rtc_setTime(unsigned char deviceRegister, unsigned char value){
    i2c_start();
    i2c_write(0xD0);
    i2c_write(deviceRegister);
    i2c_write(value);
    i2c_stop();
}

unsigned char *rtc_getTime(unsigned char deviceRegister){

    unsigned char *data;

    i2c_start();
    i2c_write(0xD0);
    i2c_write(deviceRegister);
    i2c_stop();

    i2c_start();
    i2c_write(0xD1);
    *data = i2c_read(0);
    i2c_stop();

    return data;
}

void lcdCommand( unsigned char cmnd ){
  LCD_DPRT = cmnd;
  LCD_CPRT &= ~ (1<<LCD_RS);
  LCD_CPRT &= ~ (1<<LCD_RW);
  LCD_CPRT |= (1<<LCD_EN);
  _delay_us(1);
  LCD_CPRT &= ~ (1<<LCD_EN);
  _delay_us(100);
}

void lcdData( unsigned char data ){
  LCD_DPRT = data;
  LCD_CPRT |= (1<<LCD_RS);
  LCD_CPRT &= ~ (1<<LCD_RW);
  LCD_CPRT |= (1<<LCD_EN);
  _delay_us(1);
  LCD_CPRT &= ~ (1<<LCD_EN);
  _delay_us(100);
}

void lcd_init(){
  LCD_DDDR = 0xFF;
  LCD_CDDR = 0xFF;

  LCD_CPRT &=~(1<<LCD_EN);
  _delay_us(2000);
  lcdCommand(0x38);
  lcdCommand(0x0E);
  lcdCommand(0x01);
  _delay_us(2000);
  lcdCommand(0x06);
}

void lcd_gotoxy(unsigned char x, unsigned char y){
 unsigned char firstCharAdr[]={0x80,0xC0,0x94,0xD4};//table 12-5
 lcdCommand(firstCharAdr[y-1] + x - 1);
 _delay_us(100);
}

void lcd_print( const char * str ){
  unsigned char i = 0 ;
  while(str[i]!=0)
  {
    lcdData(str[i]);
    i++ ;
  }
}

When I run this program I get the following output on the LCD.

1. Why isn't the hours appearing on the LCD?
2. How can I output the hours on the LCD (code wise)?

When I build the program I get the following warnings.

clock_tester.c: In function 'main':
clock_tester.c:48:15: warning: passing argument 1 of 'lcd_print' makes pointer from integer without a cast [-Wint-conversion]
     lcd_print(hours[0]);
               ^
clock_tester.c:35:6: note: expected 'const __memx char *' but argument is of type 'unsigned char'
 void lcd_print( const char * str );
      ^
clock_tester.c:50:15: warning: passing argument 1 of 'lcd_print' makes pointer from integer without a cast [-Wint-conversion]
     lcd_print(hours[1]);
               ^
clock_tester.c:35:6: note: expected 'const __memx char *' but argument is of type 'unsigned char'
 void lcd_print( const char * str );
      ^
clock_tester.c: In function 'rtc_getTime':
clock_tester.c:111:8: warning: 'data' is used uninitialized in this function [-Wuninitialized]
  *data = i2c_read(0);