Write Python program with the following functions:

A recursive function called stutter that returns a string with each character in its argument repeated. For example, if the string passed to stutter is "abc", stutter will return the string "aabbcc".

A recursive function called toNumber that returns the integer sum of all digit characters in a string. For example, the result of toNumber("ab3c7d1") would be 11. Assume that the length of any empty string is 0. (Hint: you may use the method isdigit() to check whether or not a character is a digit.)

Add a main function to test your code.