c struct with char * field to compose struct array

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

void retrieveUuid(char *uuidValue);
 
struct bookStruct
{
    int Year;
    char * Author;
};

 
void struct4();  

int main()
{
    struct4();
}

void struct4()
{    
    struct bookStruct arr[100]; 
    char *author=(char*)malloc(40); 

    for(int i=0;i<100;i++)
    {   
        struct bookStruct book;
        retrieveUuid(author);          
        book.Year=2000+i; 
        book.Author=(char*)malloc(40);
        const char *author2=author;
        strcpy(book.Author,author2);         
        //printf("book.Author=%s\n",book.Author);        
        arr[i]=book; 
    }

    for(int i=0;i<100;i++)
    {
        printf("Year=%d,Author=%s\n",arr[i].Year,arr[i].Author);
    }
    free(author); 
}  
 
void retrieveUuid(char *uuidValue)
{
    uuid_t newUUID;
    uuid_generate(newUUID);
    uuid_unparse(newUUID, uuidValue);
}