C语言Malloc and Strcpy，九九海子吧

请问这个应该怎么解决？要求是需要使用 malloc 和 free。照片第一张是原题，第二张是机翻。求大lao忙帮，蟹蟹。

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

char *copyString(char *str);

int main(int argc, char* argv[]) {
    // TODO BELOW
    //  part 2: need to check if "argc" is correct, and return appropriate message if not
    // TODO ABOVE

    char *argvCopy = copyString(argv[1]);
    printf("String 1: %s\n", argv[1]);
    printf("String 2: %s\n", argvCopy);

    // TODO BELOW
    //  part 3: some code here is missing! That will prevent memory leaks
    // TODO ABOVE
    return 0;
}

char *copyString(char *str) {
    // TODO BELOW
    //  part 1: need to use "malloc" to create new memory of the right size
    //  then use "strcpy" to copy data from string into your new array
    // TODO ABOVE
}

英文能翻译一下不，看不懂啊

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *copyString(char *str);
int main(int argc, char* argv[]) {
    // TODO BELOW
    //  part 2: need to check if "argc" is correct, and return appropriate message if not
    // TODO ABOVE
    char *argvCopy = copyString(argv[1]);
    printf("String 1: %s\n", argv[1]);
    printf("String 2: %s\n", argvCopy);
    free(argvCopy);
    system("pause");
    // TODO ABOVE
    return 0;
}
char *copyString(char *str) {
    // TODO BELOW
    char *p = (char*)malloc(strlen(str)+1);
    strcpy(p,str);
    return p;
    //  part 1: need to use "malloc" to create new memory of the right size
    //  then use "strcpy" to copy data from string into your new array
    // TODO ABOVE
}