Split out bech32 separator char to header

src/bech32.cpp

@@ -364,7 +364,7 @@ std::string Encode(Encoding encoding, const std::string& hrp, const data& values
     std::string ret;
     ret.reserve(hrp.size() + 1 + values.size() + CHECKSUM_SIZE);
     ret += hrp;
-    ret += '1';
+    ret += SEPARATOR;
     for (const uint8_t& i : values) ret += CHARSET[i];
     for (const uint8_t& i : CreateChecksum(encoding, hrp, values)) ret += CHARSET[i];
     return ret;
@@ -374,7 +374,7 @@ std::string Encode(Encoding encoding, const std::string& hrp, const data& values
 DecodeResult Decode(const std::string& str, CharLimit limit) {
     std::vector<int> errors;
     if (!CheckCharacters(str, errors)) return {};
-    size_t pos = str.rfind('1');
+    size_t pos = str.rfind(SEPARATOR);
     if (str.size() > limit) return {};
     if (pos == str.npos || pos == 0 || pos + CHECKSUM_SIZE >= str.size()) {
         return {};
@@ -413,7 +413,7 @@ std::pair<std::string, std::vector<int>> LocateErrors(const std::string& str, Ch
         return std::make_pair("Invalid character or mixed case", std::move(error_locations));
     }
 
-    size_t pos = str.rfind('1');
+    size_t pos = str.rfind(SEPARATOR);
     if (pos == str.npos) {
         return std::make_pair("Missing separator", std::vector<int>{});
     }