style(error): fix formatting

Author: threeal

error/include/error/error.hpp

@@ -9,7 +9,7 @@ namespace error {
  */
 class Error : public std::exception {
  private:
-  const char* message;  /**< The error message. */
+  const char* message; /**< The error message. */
 
  public:
   /**

error/src/error.cpp

@@ -4,8 +4,6 @@ namespace error {
 
 Error::Error(const char* message) : message(message) {}
 
-const char* Error::what() const noexcept {
-  return message;
-}
+const char* Error::what() const noexcept { return message; }
 
 }  // namespace error