initial

shared/Cargo.toml

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+[package]
+name = "shared"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

shared/src/answer.rs

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+use std::fmt::{self, Display, Formatter, write};
+
+#[derive(PartialEq)]
+pub enum Answer {
+    String(String),
+    Number(u64),
+    Float(f64),
+    Unimplemented,
+}
+
+impl Display for Answer {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        match self {
+            Answer::String(s) => write!(f, "{s}"),
+            Answer::Number(n) => write!(f, "{n}"),
+            Answer::Float(d) => write!(f, "{d}"),
+            Answer::Unimplemented => write!(f, "Unimplemented"),
+        }
+    }
+}
+
+impl From<String> for Answer {
+    fn from(value: String) -> Self {
+        Self::String(value)
+    }
+}
+
+impl From<&str> for Answer {
+    fn from(value: &str) -> Self {
+        Self::String(value.to_string())
+    }
+}
+
+impl From<f64> for Answer {
+    fn from(value: f64) -> Self {
+        Self::Float(value)
+    }
+}
+
+impl From<f32> for Answer {
+    fn from(value: f32) -> Self {
+        Self::Float(value as f64)
+    }
+}
+
+macro_rules! impl_from_numeric {
+    ($($type:ty),*) => {
+        $(
+            impl From<$type> for Answer {
+                fn from(item: $type) -> Self {
+                    Answer::Number(item as u64)
+                }
+            }
+        )*
+    };
+}
+
+impl_from_numeric!(u8, u16, u32, u64, usize, i8, i16, i32, i64, isize);
+

shared/src/lib.rs

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+mod answer;
+mod input_data;
+mod solution;
+
+pub use answer::Answer;
+pub use solution::Solution;
+

shared/src/solution.rs

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+use crate::Answer;
+
+pub trait Solution {
+    fn part_1(&self, input: &str) -> Answer;
+    fn part_2(&self, input: &str) -> Answer;
+}