3 - Reverse string

reverse_string.c

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

int main()

{

   char str[100], strmain[100], strup[100];



   printf("Enter the string to reverse:\n");

   gets(str);

    for (int i = 0; str[i] != '\0'; i++) {
        strup[i] = toupper(str[i]);
    }


   strcpy(strmain, strup);

   strrev(strup);

   printf("Final result: %s%s \n", strmain, strup);

   return 0;

}