能帮我写的代码改改吗

就是运行后例如把comp变成computer

```c
#include <stdio.h>

#define MAX_SIZE 1002

void interject(char *str, char *interject, int index) {


}


int main(void) {
    char str1[MAX_SIZE] = "Comp Science";
    printf("%s -> ", str1);
    interject(str1, "uter", 4);
    printf("%s\n", str1);

    char str2[MAX_SIZE] = "Beginnings";
    printf("%s -> ", str2);
    interject(str2, "New ", 0);
    printf("%s\n", str2);

    char str3[MAX_SIZE] = "The End!";
    printf("%s -> ", str3);
    interject(str3, " Is Nigh", 7);
    printf("%s\n", str3);

    char str4[MAX_SIZE] = "UNSW Other Unis";
    printf("%s -> ", str4);
    interject(str4, "> ", 5);
    printf("%s\n", str4);

    return 0;
}

```

我运行出来是这样的