Fix typos and improve Radix

hel/src/commands.rs

@@ -228,7 +228,7 @@ impl<'a> LKEval<'a> {
                     };
                 }
             }
-            Err(e) => out.e(format!("error: faild to parse command {}: {}", command, e.to_string())),
+            Err(e) => out.e(format!("error: failed to parse command {}: {}", command, e.to_string())),
         };
     }
 
@@ -330,7 +330,7 @@ impl<'a> LKEval<'a> {
         } else {
             match save_dump(&self.state.lock().borrow().db, &script) {
                 Ok(()) => out.o(format!("Passwords saved to file {}", script)),
-                Err(e) => out.e(format!("error: failed to dump passswords to {}: {}", script, e.to_string())),
+                Err(e) => out.e(format!("error: failed to dump passwords to {}: {}", script, e.to_string())),
             };
         }
     }

hel/src/structs.rs

@@ -317,7 +317,7 @@ pub struct Radix {
 impl Radix {
     pub fn new(x: i32, radix: u32) -> Result<Self, &'static str> {
         if radix < 2 || radix > 36 {
-            Err("Unnsupported radix")
+            Err("Unsupported radix")
         } else {
             Ok(Self { x, radix })
         }
@@ -333,11 +333,16 @@ impl fmt::Display for Radix {
         };
         let mut result = Vec::new();
 
+        // Convert to requested radix by repeated division
         while x != 0 {
             let (n, m) = x.div_rem(&self.radix);
             result.push(std::char::from_digit(m as u32, self.radix).unwrap());
             x = n;
         }
+        // Ensure 0 is represented with a single digit
+        if result.is_empty() {
+            result.push('0');
+        }
 
         if negative {
             write!(f, "-")?;
@@ -527,4 +532,11 @@ mod tests {
         );
         assert_eq!(std::fs::read_to_string("test_pb_out").expect("read"), "san bud most noon jaw cash");
     }
+
+    #[test]
+    fn radix_display_zero() {
+        assert_eq!(format!("{}", Radix::new(0, 10).unwrap()), "0");
+        assert_eq!(format!("{}", Radix::new(15, 16).unwrap()), "f");
+        assert_eq!(format!("{}", Radix::new(-15, 16).unwrap()), "-f");
+    }
 }