manifest: link up lib and src

Cargo.lock

@@ -3,3 +3,10 @@
 [[package]]
 name = "astrofarm"
 version = "0.1.0"
+dependencies = [
+ "gempress",
+]
+
+[[package]]
+name = "gempress"
+version = "0.1.0"

Cargo.toml

@@ -7,3 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+gempress = { path = "lib/gempress" }

lib/gempress/src/lib.rs

@@ -1,7 +1,11 @@
+pub fn add(a: u32, b: u32) -> u32 {
+    return a + b;
+}
+
 #[cfg(test)]
 mod tests {
     #[test]
     fn it_works() {
-        assert_eq!(2 + 2, 4);
+        assert_eq!(add(1, 1), 2);
     }
 }

src/main.rs

@@ -1,3 +1,5 @@
+extern crate gempress;
+
 fn main() {
-    println!("Hello, world!");
+    println!("{}", gempress::add(1, 1));
 }