Tidy a name

People type names in many ways, for example " aDA loVElace ". A form should save every name in one fixed way.

Write tidyName(name). It takes a string and returns the tidy version:

• Remove the spaces at the start and at the end.
• Replace each run of spaces inside the name with one space.
• Write the first letter of each word in upper case, and the other letters in lower case.

The input holds only letters and spaces. It can be empty. For an empty input, return "".

Examples

Call	Result
tidyName(' aDA loVElace ')	'Ada Lovelace'
tidyName('grace hopper')	'Grace Hopper'
tidyName('')	''