arduino due ignore lines in the program

hello folks,
i have problem programing arduino due : code :

code: [select]


char *msg="cc";
   
    *msg=(char)(analogread(a0)/4);
    *(msg+1)='a';
    serial.println(*(msg+1));
    driver.send((uint8_t *)msg, strlen(msg));
    driver.waitpacketsent();


so want send potentiometer values on 433 module transmitter arduino due , reseiver arduino uno, problem arduino due not want execute

code: [select]

*msg=(char)(analogread(a0)/4); ,

code: [select]

*(msg+1)='a'; when added

code: [select]

serial.println(*(msg+1)); and 

code: [select]

serial.println(*(msg+1)); shows initial values : "cc", testet other circuitry seams work perfectly, on receiver cc ... going wrong ?
thanks trying help.
have nice day.

where declaration of msg[]? how big it?

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