Fix clippy::option_if_let_else warnings

Author: pvdrz

src/lib.rs

@@ -143,7 +143,8 @@
 #![warn(
     clippy::use_self,
     clippy::too_long_first_doc_paragraph,
-    clippy::redundant_pub_crate
+    clippy::redundant_pub_crate,
+    clippy::option_if_let_else
 )]
 
 pub use binary_heap::BinaryHeap;

src/string/mod.rs

@@ -581,10 +581,10 @@ impl<S: VecStorage<u8> + ?Sized> StringInner<S> {
     /// ```
     #[inline]
     pub fn remove(&mut self, index: usize) -> char {
-        let ch = match self[index..].chars().next() {
-            Some(ch) => ch,
-            None => panic!("cannot remove a char from the end of a string"),
-        };
+        let ch = self[index..]
+            .chars()
+            .next()
+            .unwrap_or_else(|| panic!("cannot remove a char from the end of a string"));
 
         let next = index + ch.len_utf8();
         let len = self.len();