Change algorithm for finding largest common sequence, change SequenceMatcher to generic

src/utils.rs

@@ -1,17 +1,3 @@
-pub fn slice_str(string: &str, start: usize, end: usize) -> Option<&str>
-{
-	if start >= end{
-	    return None
-    }
-    if start > string.len() || end > string.len(){
-    	return None
-    }
-    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
@@ -36,4 +22,17 @@ pub fn count_leading(line: &str, c: char) -> usize {
         i += 1;
     }
     return i
-} 
+}
+
+
+pub fn format_range_unified(start:usize, end: usize) -> String {
+    let mut beginning = start + 1;
+    let length = end - start;
+    if length == 1 {
+        return format!("{}", beginning)
+    }
+    if length == 0 {
+        beginning -= 1;
+    }
+    format!("{},{}", beginning, length)
+}