add clearer text

src/bin/interactive.rs

@@ -213,7 +213,7 @@ fn menu_op(
         .add(CMI::History, "Transaction History")
         .add(CMI::Transfer, "Transfer Dusk")
         .add(CMI::Stake, "Stake Dusk")
-        .add(CMI::StakeAllow, "Stake Allow")
+        .add(CMI::StakeAllow, "Allow staking key")
         .add(CMI::StakeInfo, "Check existing stake")
         .add(CMI::Unstake, "Unstake Dusk")
         .add(CMI::Withdraw, "Withdraw staking reward")

src/bin/io/prompt.rs

@@ -232,11 +232,18 @@ fn check_valid_denom(value: f64, balance: Dusk) -> Result<(), String> {
 }
 
 fn check_valid_pkey(key: &str) -> Result<(), String> {
-    let key_length = bs58::decode(key).into_vec().unwrap_or(vec![]).len();
+    let key_length = match bs58::decode(key).into_vec() {
+        Ok(v) => v.len(),
+        Err(_) => {
+            return Err(
+                "Please introduce a valid provisioner key (Base58)".to_string()
+            )
+        }
+    };
     if key_length == PROVISIONER_KEY_LENGTH {
         Ok(())
     } else {
-        Err("Please introduce a valid provisioner key".to_string())
+        Err(format!("Invalid provisioner key length. Key should be {} bytes long but was {} bytes long", PROVISIONER_KEY_LENGTH, key_length))
     }
 }