Fix clippy (#15489)

# Description
There are some clippy(version 0.1.86) errors on nushell repo. This pr is
trying to fix it.

# User-Facing Changes
Hopefully none.

# Tests + Formatting
NaN

# After Submitting
NaN

crates/nu-command/src/debug/inspect_table.rs

@@ -118,7 +118,7 @@ fn increase_string_width(text: &mut String, total: usize) {
     let rest = total - width;
 
     if rest > 0 {
-        text.extend(std::iter::repeat(' ').take(rest));
+        text.extend(std::iter::repeat_n(' ', rest));
     }
 }
 

crates/nu-command/src/filesystem/ls.rs

@@ -378,10 +378,7 @@ fn ls_for_one_pattern(
                 .par_bridge()
                 .filter_map(move |x| match x {
                     Ok(path) => {
-                        let metadata = match std::fs::symlink_metadata(&path) {
-                            Ok(metadata) => Some(metadata),
-                            Err(_) => None,
-                        };
+                        let metadata = std::fs::symlink_metadata(&path).ok();
                         let hidden_dir_clone = Arc::clone(&hidden_dirs);
                         let mut hidden_dir_mutex = hidden_dir_clone
                             .lock()

crates/nu-command/src/filters/chunks.rs

@@ -243,7 +243,7 @@ mod test {
         let chunks = chunk_read.map(|e| e.unwrap()).collect::<Vec<_>>();
         assert_eq!(
             chunks,
-            [s[..4].as_bytes(), s[4..8].as_bytes(), s[8..].as_bytes()]
+            [&s.as_bytes()[..4], &s.as_bytes()[4..8], &s.as_bytes()[8..]]
         );
     }
 
@@ -260,7 +260,7 @@ mod test {
         let chunks = chunk_read.map(|e| e.unwrap()).collect::<Vec<_>>();
         assert_eq!(
             chunks,
-            [s[..4].as_bytes(), s[4..8].as_bytes(), s[8..].as_bytes()]
+            [&s.as_bytes()[..4], &s.as_bytes()[4..8], &s.as_bytes()[8..]]
         );
     }
 

crates/nu-command/src/math/utils.rs

@@ -102,7 +102,7 @@ pub fn calculate(
             mf(&new_vals?, span, name)
         }
         PipelineData::Value(val, ..) => mf(&[val], span, name),
-        PipelineData::Empty { .. } => Err(ShellError::PipelineEmpty { dst_span: name }),
+        PipelineData::Empty => Err(ShellError::PipelineEmpty { dst_span: name }),
         val => Err(ShellError::UnsupportedInput {
             msg: "Only ints, floats, lists, records, or ranges are supported".into(),
             input: "value originates from here".into(),

crates/nu-command/src/network/http/client.rs

@@ -723,7 +723,7 @@ fn transform_response_using_content_type(
                         )
                 })?
                 .path_segments()
-                .and_then(|segments| segments.last())
+                .and_then(|mut segments| segments.next_back())
                 .and_then(|name| if name.is_empty() { None } else { Some(name) })
                 .and_then(|name| {
                     PathBuf::from(name)

crates/nu-command/src/path/join.rs

@@ -175,7 +175,7 @@ fn run(call: &Call, args: &Arguments, input: PipelineData) -> Result<PipelineDat
             handle_value(stream.into_value(), args, head),
             metadata,
         )),
-        PipelineData::Empty { .. } => Err(ShellError::PipelineEmpty { dst_span: head }),
+        PipelineData::Empty => Err(ShellError::PipelineEmpty { dst_span: head }),
         _ => Err(ShellError::UnsupportedInput {
             msg: "Input value cannot be joined".to_string(),
             input: "value originates from here".into(),