refactor: remove old exec file

wfassoc-exec/src/runner.rs

@@ -82,11 +82,15 @@ fn stringified_exts_to_indices(
 // region: Respective Runners
 
 fn run_register(mut program: wfassoc::Program, scope: wfassoc::Scope) -> Result<()> {
-    Ok(program.register(scope)?)
+    program.register(scope)?;
+    println!("Application now is installed.");
+    Ok(())
 }
 
 fn run_unregister(mut program: wfassoc::Program, scope: wfassoc::Scope) -> Result<()> {
-    Ok(program.unregister(scope)?)
+    program.unregister(scope)?;
+    println!("Application now is uninstalled.");
+    Ok(())
 }
 
 fn run_status(program: wfassoc::Program, scope: wfassoc::Scope) -> Result<()> {
@@ -108,6 +112,8 @@ fn run_ext_link(
     for index in exts {
         program.link_ext(scope, index)?;
     }
+
+    println!("File extension now is linked.");
     Ok(())
 }
 
@@ -120,6 +126,8 @@ fn run_ext_unlink(
     for index in exts {
         program.link_ext(scope, index)?;
     }
+    
+    println!("File extension now is unlinked.");
     Ok(())
 }