MyStringv2, C++ (gcc)

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//Title of this code

#include <iostream>
#include <cstring>
#include <cstdlib>
using namespace std;

class MyString {
    char* str;
  
  public:
    MyString(const char*);
    MyString(const MyString&);
    ~MyString();

MyString& operator+=(const MyString&);
    MyString& operator+=(const char*);
    
    friend ostream& operator<<(ostream&, const MyString&);
};

MyString::MyString(const char* s) {
    this->str = static_cast<char*>(malloc(sizeof(char) * (strlen(s) + 1)));
    strcpy(this->str, s);
}

MyString::MyString(const MyString& s) {
    this->str = static_cast<char*>(malloc(sizeof(char) * (strlen(s.str) + 1)));
    strcpy(this->str, s.str);
}

MyString::~MyString() {
    free(str);
}

MyString& MyString::operator+=(const MyString& s) {
    *this += s.str;
    return *this;
}

MyString& MyString::operator+=(const char* s) {
    int newSize = strlen(this->str) + strlen(s) + 1;
    this->str = static_cast<char*>(realloc(this->str, newSize * sizeof(char)));    
    strcpy(this->str + (strlen(str)), s);

return *this;
}

MyString operator+(const MyString& s1, const MyString& s2) {
    MyString s = s1;
    return s += s2;
}

MyString operator+(const char* s1, const MyString& s2) {
    MyString s(s1);
    return s += s2;
}

MyString operator+(const MyString& s1, const char* s2) {
    MyString s(s1);
    return s += s2;
}

ostream& operator<<(ostream &output, const MyString &s) 
{ 
    output << s.str;
    return output;            
}

int main()
{
    MyString s1("abc");
    MyString s2("def");
    MyString s3 = s1 + s2 + s1 +"s";
    
    cout << s1 << " + " << s2 << " = " << s3;
}

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Compilation time: 0.31 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.46 sec