namespace my_cstring {
    char * strcat(char * destination, const char * source) {
	    char * destcopy = destination;
        while (*destination != '\0') {
            destination++;
        }
        while (*source != '\0') {
            *destination = *source;
            destination++;
            source++;
        }
        *destination = *source;
        return destcopy;
    }
}