#pragma once
#include <cctype>
#include <cstring>
#include <iostream>
#include <vector>
class String {
 public:
  explicit String();
  explicit String(size_t size, char character);
  String(const char* const_str);
  String(const String& source);
  void Swap(String& src);
  String& operator=(const String& src);
  ~String();
  size_t Size() const;
  size_t& Size();
  size_t& Capacity();
  const char* Data();
  const char* Data() const;
  bool Empty() const;
  char& operator[](size_t index);
  const char& operator[](size_t index) const;
  size_t Capacity() const;
  void Resize(size_t new_size);
  void Resize(size_t new_size, char character);
  void PushBack(char character);
  void Reserve(size_t new_cap);
  void PopBack();
  void ShrinkToFit();
  void Clear();
  char& Front();
  const char& Front() const;
  const char& Back() const;
  char& Back();
  friend std::ostream& operator<<(std::ostream& os, const String& str);
  friend std::istream& operator>>(std::istream& is, String& str);
  String operator+(const String& other) const;
  String& operator+=(const String& other);
  String& operator*=(size_t n);
  String operator*(size_t n) const;
  bool operator==(const String& other) const;
  bool operator<=(const String& other) const;
  bool operator<(const String& other) const;
  bool operator>(const String& other) const;
  bool operator>=(const String& other) const;
  bool operator!=(const String& other) const;
  String Join(const std::vector<String>& strings) const;
  std::vector<String> Split(const char* separator = " ") const;
  void Print() const;
  void Free();

 private:
  unsigned long size_;
  unsigned long capacity_;
  char* string_;
};
// void Substr(const char* input, int offset, int len, char* dest);