dircolor purify forward match '#'

src/uu/dircolors/src/dircolors.rs

@@ -191,27 +191,28 @@ pub trait StrUtils {
 
 impl StrUtils for str {
     fn purify(&self) -> &Self {
-        let line = if self.as_bytes().first() == Some(&b'#') {
-            // Ignore if '#' is at the beginning of line
-            &self[..0]
-        } else {
         let mut line = self;
         for (n, _) in self
             .as_bytes()
             .iter()
             .enumerate()
-                .rev()
             .filter(|(_, c)| **c == b'#')
         {
             // Ignore the content after '#'
             // only if it is preceded by at least one whitespace
-                if self[..n].chars().last().unwrap().is_whitespace() {
+            match self[..n].chars().last() {
-                    line = &self[..n];
+                Some(c) if c.is_whitespace() => {
+                    line = &self[..n - c.len_utf8()];
                     break;
                 }
+                None => {
+                    // n == 0
+                    line = &self[..0];
+                    break;
+                }
+                _ => (),
+            }
         }
-            line
-        };
         line.trim()
     }