Add ability to calculate ratio

src/utils.rs

@@ -9,4 +9,12 @@ pub fn slice_str(string: &str, start: usize, end: usize) -> Option<&str>
     unsafe{
     	Some(string.slice_unchecked(start, end))
     }
+}
+
+
+pub fn calculate_ratio(matches: usize, length: usize) -> f32{
+	if length != 0{
+		return 2.0 * matches as f32 / length as f32
+	}
+	return 1.0
 }