3 files changed, 45 insertions, 0 deletions
diff --git a/lib/src/error.rs b/lib/src/error.rs
new file mode 100644
index 0000000..cd4a760
--- /dev/null
+++ b/lib/src/error.rs
@@ -0,0 +1,30 @@
+#[derive(Debug)]
+pub enum Error {
+    IO(std::io::Error),
+}
+
+impl std::error::Error for Error { }
+
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Error::IO(e) => e.fmt(f),
+        }
+    }
+}
+
+impl std::cmp::PartialEq for Error {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Error::IO(_), Error::IO(_)) =>
+                false,
+        }
+    }
+}
+
+impl From<std::io::Error> for Error {
+    fn from(e: std::io::Error) -> Error {
+        Error::IO(e)
+    }
+}
+
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
new file mode 100644
index 0000000..b198f10
--- /dev/null
+++ b/lib/src/lib.rs
@@ -0,0 +1,11 @@
+pub mod error;
+pub mod prelude;
+
+pub use crate::prelude::Result;
+
+
+pub fn greeting() -> Result<()> {
+  println!("Hello, Irenes!");
+
+  Ok(())
+}
diff --git a/lib/src/prelude.rs b/lib/src/prelude.rs
new file mode 100644
index 0000000..a4e81eb
--- /dev/null
+++ b/lib/src/prelude.rs
@@ -0,0 +1,4 @@
+use crate::error::Error;
+
+pub type Result<T> = std::result::Result<T, Error>;
+