Reverse a String In-Place

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    char *head = str;
    char *tail = NULL;

    // get the str length
    int len = 0;
    while (*str++ != '\0' ) {
        len++;
    }
    tail = head + len - 1;
    
    // reverse logic:
    while (head < tail) {
        char t = *head;
        *head = *tail;
        *tail = t;
        head++;
        tail--;
    }
}

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;
}