Add code to print letter C pattern. (Fixes Issue #326)

[ilimugur]

Issue #326

There are 4 repeating string patterns in a particular order. Defining those patterns, along with the order of repetition, the code achieves printing the letter C, as asked by the issue.

Checklist:

• [x] I have mentioned the question as comment in my solution file.
  

• [x] My code follows the guidelines of this project.
  

• [x] I have performed a self-review of my own code.
  

• [x] I have commented my code.
  

• [x] My code gives the correct output.
  

• [x] I confirm that I have not copied the code from anywhere. In case its found that I have copied even after successful merge then I can be banned from the repository and hacktoberfest.
  

• [x] I affirm that I strictly follow contributing guidelines and code of conduct.

[SarthakKeshari]

@ilimugur, Kindly refer your PR #345