i. Add a function named length() to this program that takes a string (e.g., x) parameter and returns the total number of characters in x. You must NOT use the built-in len() method to solve this problem.
i. Add a function named length() to this program that takes a string (e.g., x) parameter and returns the total number of characters in x. You must NOT use the built-in len() method to solve this problem.
ii. Add a function named count_all() to this program that takes two parameters, a list of characters (e.g., x) and a character (e.g., y), in this order. This function must return the total number of times y appears in x. You must NOT use the built-in count() method to solve this problem.
iii. Add a function named lowercase() to this program that takes a list of uppercase letters as a parameter (e.g., x). This function must convert each uppercase letter in x to lowercase and return the list. Your function must use the ord() and chr() functions to solve this problem. You must NOT use the built-in lower() method.
Hint: for any letter, the difference between its lowercase and uppercase ASCII values is 32. For example, ASCII values of 'a' and 'A' are 97 and 65, respectively; ASCII values of 'z' and 'Z' are 122 and 90, respectively.
iv. Add a main() function to this program. Call all three functions in main() with suitable values and print the results. You must add the main guard and call main().
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