Fix clippy error (#40)

README.md

@@ -28,7 +28,7 @@ The detailed experimental settings and other results are available on [Wiki](htt
 Crawdad contains the two trie implementations:
 
 - `crawdad::Trie` is a standard trie form that often provides the fastest queries.
-- `crawdad::MpTrie` is a minimal-prefix trie form that is memory-efficient for long strings. 
+- `crawdad::MpTrie` is a minimal-prefix trie form that is memory-efficient for long strings.
 
 ## Slack
 

src/mptrie.rs

@@ -272,7 +272,7 @@ impl MpTrie {
 
     #[inline(always)]
     fn tail_iter(&self, tail_pos: usize) -> TailIter {
-        let tail_len = usize::try_from(self.tails[tail_pos]).unwrap();
+        let tail_len = usize::from(self.tails[tail_pos]);
         TailIter {
             trie: self,
             pos: tail_pos + 1,
@@ -417,7 +417,7 @@ impl Iterator for TailIter<'_> {
     fn next(&mut self) -> Option<Self::Item> {
         if self.len != 0 {
             let c = utils::unpack_u32(&self.trie.tails[self.pos..], self.trie.code_size);
-            self.pos += usize::try_from(self.trie.code_size).unwrap();
+            self.pos += usize::from(self.trie.code_size);
             self.len -= 1;
             Some(c)
         } else {