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

int main() {
    char input_string[] = "my name adarsh";
    char search[] = "name";
    char replace[] = "was";

    // Find the index of the first occurrence of "name"
    char *found = strstr(input_string, search);//3
    printf("%c",*found);

    if (found != NULL) {
        // Calculate the index)
        int index = found - input_string;//"name" - wholestr.. finds where name is present;
        printf("%d",index);

        // Create a modified string
        char modified_string[100];  // Make sure it's large enough to hold the result
        strncpy(modified_string, input_string, index);//3 ,untill *found it copies
        
        modified_string[index] = '\0';  // Null-terminate the modified string
        strcat(modified_string, replace);//we add new word
        
        strcat(modified_string, found + strlen(search));//name-> after that index is been taken
        //Since found already has whole input_string inside it we just make it to point after name
        //so " adarsh" is been updated found value

        printf("Modified string: %s\n", modified_string);
        printf("Index of 'is': %d\n", index);
    } else {
        printf("'is' not found in the input string.\n");
    }

    return 0;
}