#include <reg51.h>

// constant array in the ROM ( code section ).
char code source[] = { "rude repulsive rabbit" }; 
// pointer in DATA space to 0x000000 address in XDATA space.
char xdata *target;

main() {
 // iterators for source and target arrays.
    unsigned char i, j;
    for( i = 0, j = 0; source[i] != 0; i++, j++ ) { 
        target[j] = source[i];    
// if the current symbol is 'r', increment iterator and add to the target ' '.
        if( source[i] == 'r' )
                target[++j] = ' ';
    }
    while(1);   // dynamic halt
}