#include <stdlib.h>
int main() {
    char* A = (char*)malloc(10*sizeof(char));
    A = "123\0";
    A[0] = '1'; //5 строка

    char* B;
    B = "123456789123456789123456789123456789123456789123456789\0"; // 8 строка
    return 0;
}