use 'byte'/'bytes' for bech32(m) validation error

changed from std::string -> std::string_view

applied snake case to byteStr -> byte_str

src/key_io.cpp

@@ -146,6 +146,9 @@ CTxDestination DecodeDestination(const std::string& str, const CChainParams& par
         // The rest of the symbols are converted witness program bytes.
         data.reserve(((dec.data.size() - 1) * 5) / 8);
         if (ConvertBits<5, 8, false>([&](unsigned char c) { data.push_back(c); }, dec.data.begin() + 1, dec.data.end())) {
+
+            std::string_view byte_str{data.size() == 1 ? "byte" : "bytes"};
+
             if (version == 0) {
                 {
                     WitnessV0KeyHash keyid;
@@ -162,7 +165,7 @@ CTxDestination DecodeDestination(const std::string& str, const CChainParams& par
                     }
                 }
 
-                error_str = strprintf("Invalid Bech32 v0 address program size (%s byte), per BIP141", data.size());
+                error_str = strprintf("Invalid Bech32 v0 address program size (%d %s), per BIP141", data.size(), byte_str);
                 return CNoDestination();
             }
 
@@ -179,7 +182,7 @@ CTxDestination DecodeDestination(const std::string& str, const CChainParams& par
             }
 
             if (data.size() < 2 || data.size() > BECH32_WITNESS_PROG_MAX_LEN) {
-                error_str = strprintf("Invalid Bech32 address program size (%s byte)", data.size());
+                error_str = strprintf("Invalid Bech32 address program size (%d %s)", data.size(), byte_str);
                 return CNoDestination();
             }
 

test/functional/rpc_invalid_address_message.py

@@ -63,12 +63,12 @@ class InvalidAddressErrorMessageTest(BitcoinTestFramework):
 
     def test_validateaddress(self):
         # Invalid Bech32
-        self.check_invalid(BECH32_INVALID_SIZE, "Invalid Bech32 address program size (41 byte)")
+        self.check_invalid(BECH32_INVALID_SIZE, "Invalid Bech32 address program size (41 bytes)")
         self.check_invalid(BECH32_INVALID_PREFIX, 'Invalid or unsupported Segwit (Bech32) or Base58 encoding.')
         self.check_invalid(BECH32_INVALID_BECH32, 'Version 1+ witness address must use Bech32m checksum')
         self.check_invalid(BECH32_INVALID_BECH32M, 'Version 0 witness address must use Bech32 checksum')
         self.check_invalid(BECH32_INVALID_VERSION, 'Invalid Bech32 address witness version')
-        self.check_invalid(BECH32_INVALID_V0_SIZE, "Invalid Bech32 v0 address program size (21 byte), per BIP141")
+        self.check_invalid(BECH32_INVALID_V0_SIZE, "Invalid Bech32 v0 address program size (21 bytes), per BIP141")
         self.check_invalid(BECH32_TOO_LONG, 'Bech32 string too long', list(range(90, 108)))
         self.check_invalid(BECH32_ONE_ERROR, 'Invalid Bech32 checksum', [9])
         self.check_invalid(BECH32_TWO_ERRORS, 'Invalid Bech32 checksum', [22, 43])
@@ -105,7 +105,7 @@ class InvalidAddressErrorMessageTest(BitcoinTestFramework):
     def test_getaddressinfo(self):
         node = self.nodes[0]
 
-        assert_raises_rpc_error(-5, "Invalid Bech32 address program size (41 byte)", node.getaddressinfo, BECH32_INVALID_SIZE)
+        assert_raises_rpc_error(-5, "Invalid Bech32 address program size (41 bytes)", node.getaddressinfo, BECH32_INVALID_SIZE)
         assert_raises_rpc_error(-5, "Invalid or unsupported Segwit (Bech32) or Base58 encoding.", node.getaddressinfo, BECH32_INVALID_PREFIX)
         assert_raises_rpc_error(-5, "Invalid or unsupported Base58-encoded address.", node.getaddressinfo, BASE58_INVALID_PREFIX)
         assert_raises_rpc_error(-5, "Invalid or unsupported Segwit (Bech32) or Base58 encoding.", node.getaddressinfo, INVALID_ADDRESS)

test/functional/rpc_validateaddress.py

@@ -33,7 +33,7 @@ INVALID_DATA = [
     ),
     (
         "BC1QR508D6QEJXTDG4Y5R3ZARVARYV98GJ9P",
-        "Invalid Bech32 v0 address program size (16 byte), per BIP141",
+        "Invalid Bech32 v0 address program size (16 bytes), per BIP141",
         [],
     ),
     (
@@ -101,12 +101,12 @@ INVALID_DATA = [
     ("bc1pw5dgrnzv", "Invalid Bech32 address program size (1 byte)", []),
     (
         "bc1p0xlxvlhemja6c4dqv22uapctqupfhlxm9h8z3k2e72q4k9hcz7v8n0nx0muaewav253zgeav",
-        "Invalid Bech32 address program size (41 byte)",
+        "Invalid Bech32 address program size (41 bytes)",
         [],
     ),
     (
         "BC1QR508D6QEJXTDG4Y5R3ZARVARYV98GJ9P",
-        "Invalid Bech32 v0 address program size (16 byte), per BIP141",
+        "Invalid Bech32 v0 address program size (16 bytes), per BIP141",
         [],
     ),
     (