[astrobe_]

Like this ?

    const char* strings[]={"ab","cd", "ef", "gh", ....};
    char result[1024*1024*1024*1024];
    size_t sz=0;
    for(int i=0; i<sizeof(strings); i++)
    { size_t len=strlen(strings[i]); memcpy(result+sz, strings[i], len); sz+=len; }
    result[sz]=0;