I think I finished it...

crates/core/src/prey.rs

@@ -1,14 +1,12 @@
-use std::collections::HashSet;
 use std::fs::{File, OpenOptions};
 use std::io::Read;
-use std::path::{Path, PathBuf};
+use std::path::PathBuf;
 
 use serde::{Deserialize, Serialize};
 
 use crate::class::Class;
 use crate::meta::Meta;
 use crate::package::Package;
-use crate::prelude::Dependency;
 
 pub const F_PREY_TOML: &str = "Prey.toml";
 pub const F_PREY_LOCK: &str = "Prey.lock";
@@ -21,6 +19,15 @@ pub struct Prey {
 }
 
 impl Prey {
+    pub fn new<S: ToString>(name: S) -> Self {
+        Self {
+            package: Package {
+                entry_point: PathBuf::from(""),
+            },
+            meta: Meta::new(name),
+        }
+    }
+
     pub fn entry_point(&self) -> PathBuf {
         self.package.entry_point.clone()
     }
@@ -56,12 +63,12 @@ impl TryFrom<File> for Prey {
 /// Data struct
 #[derive(Debug, Clone, Default, Deserialize, Serialize, PartialEq, Eq)]
 pub struct PreyLock {
-    pub classes: HashSet<Class>,
+    pub classes: Vec<Class>,
 }
 
 impl PreyLock {
     pub fn with_class(&mut self, class: Class) -> &mut Self {
-        self.classes.insert(class);
+        self.classes.push(class);
         self
     }
 }