see declaration of 'strcat'怎么解决

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see declaration of 'strcat'怎么解决
#include
#include
int main()
{
char str1[] = "hello";
char str2[]="world!";
char str3[20];
strcat(str1,str2);
printf("str3[20]=%s\n",str3);
return 0;
}
代码

#include
#include
int main()
{
char str1[] = "hello";
char str2[]="world!";
char str3[20];
strcpy(str3,str1);
strcat(str3,str2);
printf("str3[20]=%s\n",str3);
return 0;
}

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