Reverse a String In-Place

Code

#include <stdio.h>
#include<string.h>
void reverse_string(char *str)
{
   char *s=str,*e=str,t;
   while(*e != '\0')
   {
    e++;
   }
   e--;
   while(s<e)
   {
     t = *s;
     *s = *e;
     *e = t;
     s++;
     e--;
   }
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    int i = 0;
    while (str[i] != '\0') {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    reverse_string(str);
    printf("%s", str);
    return 0;
}

Solving Approach