struct document get_document(char* text) { struct document doc; doc.data = NULL; doc.paragraph_count = 0;

struct paragraph para;
para.data = NULL;
para.sentence_count = 0;

struct sentence sen;
sen.data = NULL;
sen.word_count = 0;

struct word w;
w.data = NULL;

for (int i = 0; i <= strlen(text); i++) {
    char ch = text[i];

    if (ch == ' ') {
        if (w.data != NULL) {
            sen.word_count++;
            sen.data = realloc(sen.data, sen.word_count * sizeof(struct word));
            sen.data[sen.word_count - 1] = w;
            w.data = NULL;
        }
    } else if (ch == '.') {
        if (w.data != NULL) {
            sen.word_count++;
            sen.data = realloc(sen.data, sen.word_count * sizeof(struct word));
            sen.data[sen.word_count - 1] = w;
            w.data = NULL;
        }

        para.sentence_count++;
        para.data = realloc(para.data, para.sentence_count * sizeof(struct sentence));
        para.data[para.sentence_count - 1] = sen;
        sen.data = NULL;
        sen.word_count = 0;
    } else if (ch == '\n' || ch == '\0') {
        if (para.sentence_count > 0) {
            doc.paragraph_count++;
            doc.data = realloc(doc.data, doc.paragraph_count * sizeof(struct paragraph));
            doc.data[doc.paragraph_count - 1] = para;
            para.data = NULL;
            para.sentence_count = 0;
        }
    } else {
        int len = (w.data == NULL) ? 0 : strlen(w.data);
        w.data = realloc(w.data, len + 2);
        w.data[len] = ch;
        w.data[len + 1] = '\0';
    }
}

return doc;

}

struct word kth_word_in_mth_sentence_of_nth_paragraph(struct document Doc, int k, int m, int n) { return Doc.data[n - 1].data[m - 1].data[k - 1]; }

struct sentence kth_sentence_in_mth_paragraph(struct document Doc, int k, int m) { return Doc.data[m - 1].data[k - 1]; }

struct paragraph kth_paragraph(struct document Doc, int k) { return Doc.data[k - 1]; }