Exercise Set 1:
1. Write a loop that counts the number of space characters that appear a string.
2. Write a loop that counts the number of alphanumeric characters (letters or digits) that
appear a string
3. Write a loop that counts the number of lowercase characters that appear in a string
4. Write a function that accepts a string as an argument and returns true if the argument
starts with the substring 'https'. Otherwise, the function should return false.
5. Write a function that accepts a string as an argument and displays the string backwards.
6. Look at the following statement:
levels = 'Beginner, Average, Advanced, Expert'
Write a statement that splits this string, creating the following list:
['Beginner', 'Average', 'Advanced', 'Expert']
