commitbee 0.6.0

diff --git a/src/services/validator.rs b/src/services/validator.rs
new file mode 100644
index 0000000..abc1234
--- /dev/null
+++ b/src/services/validator.rs
@@ -0,0 +1,12 @@
+use crate::error::Result;
+
+/// Validate user input before processing.
+pub fn validate_input(input: &str) -> Result<()> {
+    if input.is_empty() {
+        return Err(crate::error::Error::Config("empty input".into()));
+    }
+    if input.len() > 1024 {
+        return Err(crate::error::Error::Config("input too long".into()));
+    }
+    Ok(())
+}
diff --git a/src/services/handler.rs b/src/services/handler.rs
new file mode 100644
index 0000000..def5678
--- /dev/null
+++ b/src/services/handler.rs
@@ -0,0 +1,15 @@
+use crate::error::Result;
+use super::validator::validate_input;
+
+pub struct RequestHandler;
+
+impl RequestHandler {
+    pub fn handle(&self, request: &str) -> Result<String> {
+        // Validate first, then process
+        validate_input(request)?;
+
+        // Process the validated input
+        let result = request.to_uppercase();
+        Ok(result)
+    }
+}