Enhance: Improve slug sanitization for valid Cargo package names

- Lowercase slugs and prefix with 'prob-' (e.g., 'prob-1_two_sum').
- Prevents Cargo.toml errors; applied to paths and package names.
- Ensures cross-file consistency.

Author: Antonio Bennett

src/cmds/edit.rs

@@ -108,7 +108,7 @@ use std::path::Path;
 let question: Question = qr?;
 
 if *lang == "rust" {
-    let sanitized_slug = problem.slug.replace(|c: char| !c.is_alphanumeric(), "_");
+    let sanitized_slug = problem.slug.to_lowercase().replace(|c: char| !c.is_alphanumeric(), "_");
     let code_dir_str = format!("{}/{}-{}", conf.storage.code()?, problem.fid, sanitized_slug);
     let code_dir = Path::new(&code_dir_str);
     fs::create_dir_all(code_dir)?;
@@ -120,7 +120,7 @@ if *lang == "rust" {
     let cargo_path_str = format!("{}/Cargo.toml", code_dir_str);
     let cargo_path = Path::new(&cargo_path_str);
     if !cargo_path.exists() {
-        let package_name = format!("leetcode-{}-{}", problem.fid, sanitized_slug);
+        let package_name = format!("prob-{}-{}", problem.fid, sanitized_slug);
         let cargo_content = format!(
 r#"[package]
 name = "{}"

src/helper.rs

@@ -200,7 +200,7 @@ pub fn test_cases_path(problem: &Problem) -> crate::Result<String> {
     let code_base = conf.storage.code()?;
 
     let path = if lang == "rust" {
-        let sanitized_slug = problem.slug.replace(|c: char| !c.is_alphanumeric(), "_");
+        let sanitized_slug = problem.slug.to_lowercase().replace(|c: char| !c.is_alphanumeric(), "_");
         let subdir = format!("{}-{}/tests.dat", problem.fid, sanitized_slug);
         format!("{}/{}", code_base, subdir)
     } else {
@@ -224,7 +224,7 @@ pub fn code_path(problem: &Problem, l: Option<String>) -> crate::Result<String>
     let code_base = conf.storage.code()?;
 
     let path = if lang == "rust" {
-        let sanitized_slug = problem.slug.replace(|c: char| !c.is_alphanumeric(), "_");
+        let sanitized_slug = problem.slug.to_lowercase().replace(|c: char| !c.is_alphanumeric(), "_");
         let subdir = format!("{}-{}/src/lib.rs", problem.fid, sanitized_slug);
         format!("{}/{}", code_base, subdir)
     } else {