refactor: rename modules to nicer names

src/nodes/mod.rs

@@ -6,17 +6,17 @@ use std::fmt::{Debug, Display};
 
 use rug::Float;
 
-mod evaluate;
-pub mod from_str;
+mod eval;
+pub mod parse;
 #[cfg(test)]
 mod tests;
 
 #[derive(Clone, Debug, thiserror::Error)]
 pub enum Error {
     #[error("{0}")]
-    Parsing(#[from] from_str::Error),
+    Parsing(#[from] parse::Error),
     #[error("{0}")]
-    Evaluation(#[from] evaluate::Error),
+    Evaluation(#[from] eval::Error),
 }
 
 /// helper function to parse to Nodes and immediately evaluate