Mot plusOccurences(ABR tree, Mot mot) {
    int tmp;
    Mot cFd, cFg, truc;
    if (tree == NULL) {
        return mot;
    }
    tmp = rechercheMotDonne(tree, tree->mot);
    if (tmp > mot.occurence) {
        truc.occurence = tmp;
        strcpy(truc.mot, tree->mot);
    }
    cFd = plusOccurences(tree->fd, mot);
    cFg = plusOccurences(tree->fg, mot);
    if (cFd.occurence > truc.occurence) {
        truc = cFd;
    } else if (cFg.occurence > truc.occurence) {
        truc = cFg;
    }
    return truc;
}