title: Case insensitive user input strings
body: <p>Which function to use for making user input strings case insensitive? </p>
  
  <pre><code>correctAnswer = "London"
  
  userGuess = input("What is the capital of  Great Britain?: ")
  
  if userGuess == "London":
      print("Correct!")
  else:
      print("Wrong")
  </code></pre>
  
  <p>I have tried the following functions after the string:</p>
  
  <pre><code>.lower()
  .capitalize()
  .casefold()
  </code></pre>
  
  <p>The output is still 'wrong' although the answer should be correct when input is: <br>
  - london <br>
  - lOndoN <br>
  - loNDON <br></p>
  
  <p>And so on..</p>