Write a program in c language to reverse a string in reverse order without using strrev function or any other function

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

int main()
{
char str[100], ch, str2[100];
int count = 1, i, count2 = 0;

printf("Enter String: ");
while(ch != 13)
{
ch = getche();
str[count] = ch;
count++;
}
 
    for(i=0; i<=99; i++)
    {
str2[i] = str[i];
}

    for(i=count; i>=0; i--)
    {
str[count2] = str2[i];
count2++;
}

printf("\nRevered string is\n");

for(i = 0; i < count; i++)
{
printf("%c", str[i]);
}

   getch();
}