char **addstr(char **a, const char *s)  {

    if(s!=NULL && a!=NULL)  {
        a=(char**)realloc(a, (pa-a+2)*sizeof(char*));
        char **pa=a;
        while(strcmp(*pa,""))   pa++;
        *(pa+1)=(char*)malloc(sizeof(char)*SIZE_CODE_LINE);
        **(pa+1)='\0';
        strcpy(*pa, s);
        pa=NULL;
    }
    return a;
}