refactored is_subsequence (thanks, Kübi)

src/lib.rs

@@ -18,29 +18,20 @@ fn is_subsequence(needle: &str, string: &str) -> bool {
     // we need to explicitly convert here to iterate over chars
     // (UTF-8, so possibly multiple bytes long)
     let mut chars = string.chars();
-    let needle_chars = needle.chars();
+    'needle: for nc in needle.chars() {
-    for nc in needle_chars {
+        for c in &mut chars {
-        loop {
+            if c == nc {
-            match chars.next() {
+                continue 'needle;
-                Some(current) => {
-                    // if the character matches, break and continue with the next nc
-                    if current == nc {
-                        break;
-                    }
-                }
-                _ => return false
             }
         }
+        return false;
     }
     true
 }
 
 #[cfg(test)]
 mod tests {
-    use crate::{
+    use crate::{filter_subsequence, filter_substring};
-        filter_substring,
-        filter_subsequence
-    };
 
     #[test]
     fn test_filter_substring_single() {