Implement a method that checks if a year is a leap year.

All the following rules must be satisfied:

A year is not a leap year if not divisible by 4 A year is a leap year if divisible by 4 A year is a leap year if divisible by 400 A year is not a leap year if divisible by 100 but not by 400 Examples:

1997 is not a leap year (not divisible by 4) 1996 is a leap year (divisible by 4) 1600 is a leap year (divisible by 400) 1800 is not a leap year (divisible by 4, divisible by 100, NOT divisible by 400) The method should return true if a year is a leap year, and false if it is not.