Fix cargo clippy warnings

Author: OpenByteDev

src/interpret.rs

@@ -101,7 +101,7 @@ where
                 input.read_line(&mut in_line)?;
                 let number_input = in_line
                     .parse()
-                    .or_else(|_| Err(Error::InvalidPancake(in_line.clone())))?;
+                    .map_err(|_| Error::InvalidPancake(in_line.clone()))?;
                 stack.push(number_input);
                 in_line.clear();
             }
@@ -301,7 +301,7 @@ where
                 input.read_line(&mut in_line)?;
                 let number_input = in_line
                     .parse()
-                    .or_else(|_| Err(Error::InvalidPancake(in_line.clone())))?;
+                    .map_err(|_| Error::InvalidPancake(in_line.clone()))?;
                 stack.push(number_input);
                 in_line.clear();
             }

src/parse.rs

@@ -18,7 +18,7 @@ use std::fmt::{self, Display};
 /// # }
 /// ```
 #[must_use]
-pub fn parse_program_str<'a>(program: &'a str) -> Vec<BorrowedCommand<'a>> {
+pub fn parse_program_str(program: &str) -> Vec<BorrowedCommand> {
     program
         .lines()
         .filter_map(|line| BorrowedCommand::from_line(line).ok())