feat(base64): isValid

include/base/hex.hpp

@@ -9,8 +9,10 @@ namespace hex
 {
     bool isValid(const char *str) noexcept;
     bool isValid(std::string_view str) noexcept;
+
     void encode(const uint8_t *data, size_t data_size, char *str, size_t str_size) noexcept;
     std::string encode(std::span<const uint8_t> data) noexcept;
+
     void decode(const char *str, size_t str_size, uint8_t *data, size_t data_size);
     std::vector<uint8_t> decode(std::string_view str);
 }