Develop a C program which reads and processes an input text file like this textdata.txt. It retrieves information:

• number of lines,
• number of all words,
• number of distinct non-common words,
• non-common words and their frequencies.

Note that common words, are also known as stop words, like words in this file).

It outputs the retrieved information to a file like this result.txt.

Specifically, write C source programs myword.h and myword.c containing the following:

1. structure definitions:

typedef struct word { char word[30]; int frequency; } WORD; typedef struct words { WORD word_array[1000]; int line_count; int word_count; int keyword_count; } WORDSUMMARY; 

2. void set_stopword(char *filename, char *stopwords[]); this functions reads stop words from the common word file by filename, and puts them in the stop word dictionary data structure as an array of 26 strings, each string holds all stop words starting with the same alphabet, separated by comma ,. The array of strings is passed parameter char *stopwords[], stopwords[i] holds the pointer of the i-th string.

3. int contain_word(char *stopwords[], char *word); this function checks if the given word is contained in stop word dictionary char stopwords[], it returns 1 if true otherwise 0.

4. int str_contain_word(char *str, char *word); this checks if the given *word is contained in a given string str, returns 1 if yes and 0 otherwise. For example, if str is the,this,that, word is this, then it returns 1.

5. int process_word(char *filename, WORDSUMMARY *words, char *stopwords[]); this function opens and reads text file of name passed by *filename line by line. For each line, it gets each word, if it is not a stop word, check if it is already in array words->word_array, if yes, increases its frequency by 1, otherwise inserts it to the end of the word_array and set its frequency 1. Meantime, it updates the count infomation.

6. int save_to_file(char *filename, WORDSUMMARY *words); this saves the data of WORDSUMMARY words to file of name passed by *filename in specified format.

7. Use the provided main function file a4q2.c to test your programs as the following.