fix: Adding Clone derive macro to internal model (#38)

src/model/coefficient.rs

@@ -5,7 +5,7 @@ use crate::{
     Rule,
 };
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Coefficient {
     pub var_name: String,

src/model/constraint.rs

@@ -1,6 +1,6 @@
 use super::{coefficient::Coefficient, sos::SOSClass};
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum Constraint {
     /// Standard LP constraint

src/model/lp_problem.rs

@@ -2,7 +2,7 @@ use std::collections::{hash_map::Entry, HashMap};
 
 use crate::model::{constraint::Constraint, objective::Objective, sense::Sense, variable::VariableType};
 
-#[derive(Debug, Default, PartialEq, Eq)]
+#[derive(Debug, Default, PartialEq, Eq, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct LPProblem {
     pub problem_name: String,

src/model/objective.rs

@@ -1,6 +1,6 @@
 use crate::model::coefficient::Coefficient;
 
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Objective {
     pub name: String,

src/model/sense.rs

@@ -1,4 +1,4 @@
-#[derive(Debug, Default, PartialEq, Eq)]
+#[derive(Debug, Default, PartialEq, Eq, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum Sense {
     #[default]

src/model/sos.rs

@@ -1,6 +1,6 @@
 use std::str::FromStr;
 
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum SOSClass {
     S1,

src/model/variable.rs

@@ -1,6 +1,6 @@
 use crate::Rule;
 
-#[derive(Debug, Default)]
+#[derive(Debug, Default, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 /// A enum representing the bounds of a variable
 pub enum VariableType {