Move empty range function into algorithm utils

src/algorithms/utils.rs

@@ -0,0 +1,7 @@
+use std::ops::Range;
+
+/// Utility function to check if a range is empty that works on older rust versions
+#[inline(always)]
+pub(crate) fn is_empty_range<T: PartialOrd>(range: &Range<T>) -> bool {
+    !(range.start < range.end)
+}