heap corruption detected

CStr::CStr(char *s)
{
    length = 0;
    while (s[length]) length++;
    str = new char[length+1];
        for (int i = 0; i < length; i++)
            str[i] = s[i];
    str[length+1] = '\0';
}

~CStr() {delete [] str;};

CStr(const char *s) : length(strlen(s)), str(strcpy(new char[length + 1], s)) {}

class CStr
{
protected:
    char *str;
    int length;
public:
    CStr();
    CStr(char *s);
    CStr(char ch);
    ~CStr() {delete [] str;};
    
        int get_length() const {return length;};
        void show() const;
    
    void clear() {str = '\0'; length = 1;};
    
    CStr operator= (CStr & x);
    CStr operator+ (CStr & x);
    CStr operator== (CStr & x);
};

CStr::CStr(char *s)
{
    length = 0;
    while (s[length]) length++;
    str = new char[length+1];
        for (int i = 0; i < length; i++)
            str[i] = s[i];
    str[length+1] = '\0';
}
void CStr::show() const 
{
    for (int i = 0; i < length; i++)
        cout << str[i];
}

#include <iostream>
#include <conio.h>
#include "class.h"
using namespace std;
void main()
{
    char *x = "hello my world";
    CStr B(x);
    B.show();
    B.~CStr();
    getch();
}

void CStr::show() const 
{
    for (int i = 0; i < length; i++)
        cout << str[i];
}

void CStr::show() const 
{
        cout << str;
}

B.~CStr();