Why doesn't this program reverse a string?

I am learning C. I wrote the following program to try and reverse a user-input string. However, it doesn't work. I'd like to know why.

Here is the code with comments:

#include <stdio.h>
#include <string.h>

int main(int argc, char** argv) {
    char* normal; // initialize the original string
    printf("Give me a word.\n"); // ask for user input
    scanf("%s", &*normal); // retrieve input, set variable
    int n = strlen(normal); // retrieve length of string
    char reversed[10] = {0}; // declare reversed string

    // for loop starting from n length, decrementing by one
    for(int i = n; i >= 0; i--) { 
    /* for i in the original string, the reversed string
       equals n minus i, to reverse the string one by one */ 
       normal[i] = reverse[n - i];
    }

    // print the newly reversed string
    printf("%s\n", reversed);

    return 0;
}