Trim pretty output

src/compiler.ts

@@ -31,6 +31,7 @@ export default class Compiler {
     const resultError = result.find((el) => el instanceof EnvError);
     if (resultError !== undefined) return resultError;
 
-    return result.join(this.prettyPrint ? '\n' : '');
+    const output = result.join(this.prettyPrint ? '\n' : '');
+    return this.prettyPrint ? output.trim() : output;
   }
 }