Why strrev() in C is not working with char*?

Using C programming, with GCC in windows (with CodeBlocks)Why this code doesn't work (running it gives empty console window)

# include <stdio.h># include <string.h>int main(){  char* str = "hello";  printf("%s", strrev(str));}

but using an array works fine

char str[] = "hello";

Note that strrev function prototype is:

char *strrev(char *str);