8bit reversal of all the bytes in a string

Hello everybody, Wish you all a very happy new year.

I am facing a problem, I know basically it is a C language problem but I am still not able to catch up the language yet.

I have reversed the data pins of LCD. Now while programming I can reverse the data byte by byte, but the speed of the LCD is quite low.

void LCD_sendstring(unsigned char *strLCD){     // e.g. LCD_sendstring("LCD Tutorial");
    while(*strLCD)                              //till string ends
        LCD_senddata(*strLCD++);                //send characters one by one
}


void LCD_senddata(unsigned char var){           // e.g. LCD_senddata('A');
    LCD_data = reverse(var);
    LCD_rs = 1;                 //Selected data register
    LCD_rw = 0;                 //We are writing
    LCD_en = 1;                 //Enable H->
    LCD_en = 0;
    LCD_busy1();                //Wait for LCD to process the command
}

As the above code reverses each character before sending to LCD, the characters appears slowly on LCD. So I am trying to reverse the whole string before sending to the LCD (LCD_senddata). I have tried the following codes but its not working.

void LCD_sendstring(unsigned char *strLCD){     // e.g. LCD_sendstring("LCD Tutorial");
     reverse_string(strLCD);
        *strLCD =  reverse_string1(strLCD);

        while(*strLCD)                          //till string ends
    LCD_senddata(*strLCD++);                    //send characters one by one
}


void LCD_senddata(unsigned char var){           // e.g. LCD_senddata('A');

    LCD_data = var;
    LCD_rs = 1;                 //Selected data register
    LCD_rw = 0;                 //We are writing
    LCD_en = 1;                 //Enable H->
    LCD_en = 0;
    LCD_busy1();                //Wait for LCD to process the command
}


void reverse_string(char *str){ //junk result
        while(*str){
//              *str=reverse3(*str);
                *str='B';

                str++;
        }
        str = &str;
}



char *reverse_string1(char *str){       //blank result
    int len = strlen(str);
        char *newstr = malloc(len+1);

        while(*str){                    //till string ends
//              *newstr++ = reverse(*str++);
//              *newstr++ = *str++;
                *newstr++ = 'B';
        }
        *newstr = '\0';
    return newstr;
}

In reverse_string I get junk result whereas in reverse_string1 I am getting blank display. Please Help!!!