simplify the structure of the crate

Cargo.toml

@@ -1,8 +1,14 @@
-[workspace]
-members = [
-    "lib/unified-diff",
-    "lib/context-diff",
-    "lib/normal-diff",
-    "lib/ed-diff",
-    "bin/diffutils",
-]
+[package]
+name = "diffutils"
+version = "0.3.0"
+edition = "2018"
+description = "A CLI app for generating diff files"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/notriddle/diffutils"
+
+[[bin]]
+name = "diffutils"
+path = "src/main.rs"
+
+[dependencies]
+diff = "0.1.10"

bin/diffutils/Cargo.toml

@@ -9,9 +9,3 @@ repository = "https://github.com/notriddle/diffutils"
 [[bin]]
 name = "diffutils"
 path = "main.rs"
-
-[dependencies]
-unified-diff = { path = "../../lib/unified-diff/" }
-context-diff = { path = "../../lib/context-diff/" }
-normal-diff = { path = "../../lib/normal-diff/" }
-ed-diff = { path = "../../lib/ed-diff/" }

src/main.rs

@@ -10,6 +10,10 @@ use std::fs;
 use std::io::{self, Write};
 
 mod params;
+mod normal_diff;
+mod unified_diff;
+mod context_diff;
+mod ed_diff;
 
 fn main() -> Result<(), String> {
     let opts = env::args_os();