Write a phonenumber class that gets initialized with a

Question

Write a PhoneNumber class that gets initialized with a 10-digit phone number. In the call PhoneNumber.new(ph), the input ph take any of these possible formats:

- a 10-digit integer
- a string of 10 digits
- (ddd) ddd-dddd where d is any digit [parenthesis format]
- ddd-ddd-dddd where d is any digit [hyphen format]

Wherever whitespace appears in a string format, we can have a string of zero or more whitespace characters (including before and after the string as a whole). A PhoneNumber object responds to the to_s message which returns the number as a string in parenthesis format, and the area_code, prefix, and root messages which return the parts of the number in string format, as illustrated here:

a = PhoneNumber.new(1234567890)
puts a # [phone]
puts a.area_code # 123
puts a.prefix # 456
puts a.root # 7890
puts PhoneNumber.new(' 7778889999 ') # [phone]
puts PhoneNumber.new(' [phone]') # [phone]
PhoneNumber.new('1234')
# ArgumentError: Improper phone number syntax
PhoneNumber.new('(12) 333-4444')
# ArgumentError: Improper phone number syntax
PhoneNumber.new('123- 456- 7890')
# ArgumentError: Improper phone number syntax