work1

#include <iostream>

int strlenM(const char* str)
{
    int len{ 0 };
    for (; *str++; ++len);

    return len;
}


char* strdupM(const char* src, char* dest)
{
    char* destOrig{ dest };
    while (*dest++ = *src++);
    return destOrig;
};

char* strndupM(const char* src, char* dest, int maxSize)
{
    char* destOrig{ dest };
    for (--maxSize; *dest++ = (maxSize ? *src++ : '\0'); --maxSize);
    return destOrig;
}

char* strcatM(const char* append, char* dest)
{
    char* destOrig{ dest };
    while (*dest++);
    --dest;
    while (*dest++ = *append++);
    return destOrig;
}

char* strncatM(const char* append, char* dest, int maxSize)
{
    char* destOrig{ dest };
    while(*dest++);
    --dest;
    for (--maxSize; *dest++ = (maxSize ? *append++ : '\0'); --maxSize);
    return destOrig;
}

const char* strchM(const char* str, char ch)
{
    while (*str++)
    {
        if (*str == ch) return str;
    }
    return nullptr;
}

//str = "Hello, bright world!"[7]
//
//search = "bri123"[0]

const char* strstrM(const char* str, const char* search)
{
    for (int strIdx{ 0 }; str[strIdx]; ++strIdx)
    {
        for (int searchIdx{ 0 }; str[strIdx + searchIdx] == search[searchIdx]; ++searchIdx)
        {
            if (!search[searchIdx + 1]) { return str + strIdx; }
        }
    }
    return nullptr;
}

int main()
{
    //char str[20]{ 'H','e','l','l','o','!','\0' };
    char str[120]{ "world, bright world!" };
    char* str1{ new char[20]{"Hello, world!"} };
    //std::cout << strlenM("Hello, mr. President!") << '\n';
    //std::cout << str1;

    char* strCopy{ new char[50] {"Hello, "} };
    char* inStr{new char[3]};
    std::cout << "Enter some string to inStr\n";
    std::cin.getline(inStr, 3);
    //std::cin >> inStr;
    std::cout << "inStr = " << inStr << " strlenM = " << strlenM(inStr)<< '\n';
    //std::cin >> inStr;
    //std::cout << "inStr = " << inStr << " strlenM = " << strlenM(inStr) << '\n';
    //strdupM(str, strCopy);
    //std::cout << strndupM(str, strCopy,50) << '\n';
    //std::cout << strcatM(str, strCopy) <<' ' << strlenM(strCopy) <<  '\n'; //Hello, bright world!

    //char searchCh{ 'z' };
    //const char* res{ strchM(str, searchCh) };
    //if (res)
    //{
    //    std::cout << *res << " found!";
    //}
    //else
    //{
    //    std::cout << searchCh << " NOT found!";
    //}

    //const char subStr[]{ "world" };
    //const char* res{ strstrM(str,subStr) };
    //if (res)
    //{
    //    std::cout << subStr << " found! At position " << res - str << '\n';
    //}
    //else
    //{
    //    std::cout << subStr << " NOT found!\n";
    //}
    //const char* secondMatch{ strstrM(res + strlenM(subStr),subStr) };
    //if (secondMatch)
    //{
    //    std::cout << subStr << " found! At position " << secondMatch - str << '\n';
    //}
    //else
    //{
    //    std::cout << subStr << " NOT found!" << '\n';
    //}



}