strdup(): Duplicating string

#include <stdio.h>
#include <string.h>
int main()
{
    char str1[] = "plus2net";
    char *str2;
    str2 = strdup(str1);

    printf("Duplicated string : %s", str2);
    return 0;
}

Duplicated string : plus2net

duplicate_string = strdup(main_string);