Build a function, find_middle_letters, that finds the middle of a string. If the string is an odd number of characters, it returns 1 letter. If it is an even number of characters, it returns 2 characters. It takes a string as a parameter
- Example:
- find_middle_letters('seven')
- Return: 'v'
- find_middle_letters('dish')
- Return: 'is'
- find_middle_letters('seven')