#include <stdio.h>
#include <string.h>
#include <stdlib.h>

// Задача 7. Дефинирайте стринг „I am a poor programmer”. Заменете през пойнтер “poor” с “great”.

char *replaceWord(const char *s, const char *pcOldWord, const char *pcNewWord)
{
    char *pcResult;
    int i, iCounter = 0;
    int iNewWordLength = strlen(pcNewWord);
    int iOldWordLength = strlen(pcOldWord);

    for (i = 0; s[i] != '\0'; i++)
    {
        if (strstr(&s[i], pcOldWord) == &s[i])
        {
            iCounter++;
            i += iOldWordLength - 1;
        }
    }

    pcResult = (char *)malloc(i + iCounter * (iNewWordLength - iOldWordLength) + 1);

    i = 0;
    while (*s)
    {
        if (strstr(s, pcOldWord) == s)
        {
            strcpy(&pcResult[i], pcNewWord);
            i += iNewWordLength;
            s += iOldWordLength;
        }
        else
            pcResult[i++] = *s++;
    }

    pcResult[i] = '\0';
    return pcResult;
}

int main()
{
    char str[] = "I am a poor programmer";
    char c[] = "poor";
    char d[] = "good";
    char *result = NULL;

    printf("Old string: %s\n", str);
    result = replaceWord(str, c, d);
    printf("New String: %s\n", result);

    return 0;
}