Fix validation logic and make code more readable

internal/validator/validator.go

@@ -60,6 +60,10 @@ func GreaterThan(value int, n int) bool {
 	return value > n
 }
 
+func GreaterThanOrEquals(value int, n int) bool {
+	return value >= n
+}
+
 func After(value time.Time, n time.Time) bool {
 	return value.After(n)
 }