add central helper function to format client id

1 files changed, 9 insertions, 0 deletions

diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..d2143f8
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,9 @@
+use crate::error::{Error, Result};
+
+pub fn format_client_id(client_id: &[u8]) -> Result<String> {
+    client_id
+        .iter()
+        .map(|octet| format!("{:x}", octet))
+        .reduce(|acc, octet| acc + ":" + &octet)
+        .ok_or(Error::EmptyClientId)
+}