Exercise: parse an age

Write a function func parseAge(s string) (int, error) that turns a string into an age. If the string is an integer from 0 to 150, the function returns that number and nil. Otherwise it returns 0 and an error that is not nil.

• parseAge("42") → 42, nil
• parseAge("abc") → 0 and an error
• parseAge("151") → 0 and an error

Constraints: the string may be empty or not a number; a negative number and a number above 150 are errors too, while 0 and 150 are valid ages.

Do not add extra imports unless the task says so explicitly.