#define _CRT_SECURE_NO_WARNINGS
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
 
//Replace specified string in a char string
char * strreplace(char * str, char * oldstr, char * newstr) {
    char * bstr = new char[strlen(str)];
    memset(bstr, 0, sizeof(bstr));
 
    for (int i = 0; i < strlen(str); ++i) {
        if (!strncmp(str + i, oldstr, strlen(oldstr))) {
            strcat(bstr, newstr);
            i += strlen(oldstr) - 1;
        }
        else {
            strncat(bstr, str + i, 1);
        }
    }
 
    strcpy(str, bstr);
    delete bstr;
 
    return str;
}

#define _CRT_SECURE_NO_WARNINGS
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
 
//Replace specified string in a char string
//https://zhuanlan.zhihu.com/p/364035600
wchar_t * wcsreplace(wchar_t * str, wchar_t * oldstr, wchar_t * newstr) {
    wchar_t * bstr = new wchar_t[wcslen(str)];
    memset(bstr, 0, sizeof(bstr));
 
    for (int i = 0; i < wcslen(str); ++i) {
        if (!wcsncmp(str + i, oldstr, wcslen(oldstr))) {
            wcscat(bstr, newstr);
            i += wcslen(oldstr) - 1;
        }
        else {
            wcsncat(bstr, str + i, 1);
        }
    }
 
    wcscpy(str, bstr);
    delete bstr;
 
    return str;
}