Write a C++ program for extracting the text from a webpage. Implement 4 functions, described below. Code should follow C++ conventions, and it should not use any libraries other than those we have discussed in class so far. 

• string readFile(string filename)
  • This function opens the file with the given name, reads in the entirety of the file, and returns a string containing the file contents.
  • It should return the empty string if the file doesn't exist.
• string extractParagraphs(string content)
  • This function should return all of the paragraph contents in the given HTML content, and each paragraph should be followed by two new lines (). Paragraphs in HTML start with a paragraph start tag (

    ) and end with a paragraph end tag (

    ), and the contents are between these two tags. The output should not include any of the start or end tags.
• string removeTags(string content)
  • This function should search the given HTML content and remove all of the HTML tags. All HTML tags start with a less than sign (<) and end with a greater than sign (>), and anything that begins with a less than sign and ends with a greater than sign is an HTML tag.
• int main()
  • main() should use the other 3 functions to read in the contents of input.html, extract all of the paragraphs in this file, remove the tags from the paragraphs, and print the result to cout.