A document is represented as a collection paragraphs, a paragraph is represented as a collection of sentences, a sentence is represented as a collection of words and a word is represented as a collection of lower-case ([a-z]) and upper-case ([A-Z]) English characters. You will convert a raw text document into its component paragraphs, sentences and words. To test your results, queries will ask you to return a specific paragraph, sentence or word as described below.

Alicia is studying the C programming language at the University of Dunkirk and she represents the words, sentences, paragraphs, and documents using pointers:

• A word is described by:

struct word {
    char* data;
};

• A sentence is described by:

struct sentence {
    struct word* data;
    int word_count;//the number of words in a sentence
};

The words in the sentence are separated by one space (" "). The last word does not end with a space.

• A paragraph is described by:

struct paragraph {
    struct sentence* data  ;
    int sentence_count;//the number of sentences in a paragraph
};

The sentences in the paragraph are separated by one period (".").

• A document is described by:

struct document {
    struct paragraph* data;
    int paragraph_count;//the number of paragraphs in a document
};

The paragraphs in the document are separated by one newline("\n"). The last paragraph does not end with a newline.

For example:

Learning C is fun.
Learning pointers is more fun.It is good to have pointers.

• The only sentence in the first paragraph could be represented as:

struct sentence first_sentence_in_first_paragraph;
first_sentence_in_first_paragraph.data = {"Learning", "C", "is", "fun"};

• The first paragraph itself could be represented as:

struct paragraph first_paragraph;
first_paragraph.data = {{"Learning", "C", "is", "fun"}};

• The first sentence in the second paragraph could be represented as:

struct sentence first_sentence_in_second_paragraph;
first_sentence_in_second_paragraph.data = {"Learning", "pointers", "is", "more", "fun"};

• The second sentence in the second paragraph could be represented as:

struct sentence second_sentence_in_second_paragraph;
second_sentence_in_second_paragraph.data = {"It", "is", "good", "to", "have", "pointers"};

• The second paragraph could be represented as:

struct paragraph second_paragraph;
second_paragraph.data = {{"Learning", "pointers", "is", "more", "fun"}, {"It", "is", "good", "to", "have", "pointers"}};

• Finally, the document could be represented as:

struct document Doc;
Doc.data = {{{"Learning", "C", "is", "fun"}}, {{"Learning", "pointers", "is", "more", "fun"}, {"It", "is", "good", "to", "have", "pointers"}}};

Alicia has sent a document to her friend Teodora as a string of characters, i.e. represented by not . Help her convert the document to form by completing the following functions:

• to intialise the document. You have to intialise the global variable of type .
• to return the paragraph in the document.
• to return the sentence in the paragraph.
• to return the word in the sentence of the paragraph.