fix: if leap year exercise

11-if/exercises/07-leap-year/main.go

@@ -22,6 +22,9 @@ package main
 //  go run main.go 2018
 //    2018 is not a leap year.
 //
+//  go run main.go 2100
+//    2100 is not a leap year.
+//
 //  go run main.go 2019
 //    2019 is not a leap year.
 //

11-if/exercises/07-leap-year/solution/main.go

@@ -34,6 +34,8 @@ func main() {
 	var leap bool
 	if year%400 == 0 {
 		leap = true
+	} else if year%100 == 0 {
+		leap = false
 	} else if year%4 == 0 {
 		leap = true
 	}