[PIC] need help in vertical scroll 7x32 matrix with pic18f2550 and 74hc595 shift register

 sbit Serial_Data at RA0_bit;
 sbit SH_Clk at RA1_bit;
 sbit ST_Clk at RA2_bit;
 sbit CD4017_Clk at RA2_bit;
 sbit CD4017_RST at RA1_bit;

const unsigned short CharData[][7] =
 {
   {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},   // 0x20, Space
   {0x04, 0x04, 0x04, 0x04, 0x04, 0x00, 0x04} ,  // 0x21, !
   {0x09, 0x09, 0x12, 0x00, 0x00, 0x00, 0x00},   // 0x22, "
   {0x0a, 0x0a, 0x1f, 0x0a, 0x1f, 0x0a, 0x0a} ,  // 0x23, #
   {0x04, 0x0f, 0x14, 0x0e, 0x05, 0x1e, 0x04} ,  // 0x24, $
   {0x19, 0x19, 0x02, 0x04, 0x08, 0x13, 0x13} ,  // 0x25, %
.............................................................................
 {0x00, 0x00, 0x11, 0x0a, 0x04, 0x0a, 0x11},   // 0x78, x
   {0x00, 0x11, 0x11, 0x0f, 0x01, 0x11, 0x0e},   // 0x79, y
   {0x00, 0x00, 0x1f, 0x02, 0x04, 0x08, 0x1f},   // 0x7a, z
   {0x06, 0x08, 0x08, 0x10, 0x08, 0x08, 0x06},   // 0x7b, {
   {0x04, 0x04, 0x04, 0x00, 0x04, 0x04, 0x04},   // 0x7c, |
   {0x0c, 0x02, 0x02, 0x01, 0x02, 0x02, 0x0c},   // 0x7d, }
   {0x08, 0x15, 0x02, 0x00, 0x00, 0x00, 0x00}   // 0x7e, ~

 };
  unsigned short Buffer[7][5] = {
                              {0,0,0,0,0},
                              {0,0,0,0,0},
                              {0,0,0,0,0},
                              {0,0,0,0,0},
                              {0,0,0,0,0},
                              {0,0,0,0,0},
                              {0,0,0,0,0}
                             };

unsigned int speed, StringLength;
unsigned short i, l, k, row, scroll, temp, shift_step=1;
unsigned short m, SerialConnect=0, UserIP = 0;

const unsigned char default_message[]="hello world";

void Send_Data(unsigned short rw){
 unsigned short Mask, t, num, Flag;
 for (num = 0; num < 5; num++) {
  Mask = 0x01;
  for (t=0; t<6; t++){
   Flag = Buffer[rw][num] & Mask;
   if(Flag=0) Serial_Data = 0;
   else Serial_Data = 1;
   SH_Clk = 1;
   SH_Clk = 0;
   Mask = Mask << 1;
  }
  }

  // Apply clock on ST_Clk
  ST_Clk = 1;
  ST_Clk = 0;

}

void scrollleft()
{
   StringLength = 11;//hello world
for (k=0; k<StringLength+4; k++){
  for (scroll=0; scroll<(7/shift_step); scroll++) {
   for (row=0; row<7; row++){
     index = default_message[k];
     temp = CharData[index-32][row];
     Buffer[row][4] = (Buffer[row][4] << Shift_Step) | (Buffer[row][3] >> (7-Shift_Step));
     Buffer[row][3] = (Buffer[row][3] << Shift_Step) | (Buffer[row][2] >> (7-Shift_Step));
     Buffer[row][2] = (Buffer[row][2] << Shift_Step) | (Buffer[row][1] >> (7-Shift_Step));
     Buffer[row][1] = (Buffer[row][1] << Shift_Step) | (Buffer[row][0] >> (7-Shift_Step));
     Buffer[row][0] = (Buffer[row][0] << Shift_Step)| (temp >> ((7-shift_step)-scroll*shift_step));
   }
   speed = 15;
   for(l=0; l<speed;l++){
    
CD4017_Rst = 1;
  CD4017_Rst = 0;

     for (i=0; i<7; i++) {

       Send_Data(i);
      CD4017_Clk = 1;
    CD4017_Clk = 0;
    Delay_ms(1);

     }  // i
   } // l
  } // scroll
 } // k


}

void main() {
CMCON = 0x07;   // Disable comparators
 ADCON0 = 0x00; // Select ADC channel AN0
 ADCON1 = 0b00001110;  // RA0 as analog input
 TRISC = 0x00;
 TRISB = 0xFF;
 TRISA = 0x01;

while(1){

scrollleft();

}



}