Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    char *l = str;
    char *r = str;

    while (*(r) != '\0') {
        r++;
    }

    if (r <= l) {
        return;
    }

    r = r - 1;

    while (l < r) {
        char tmp = *l;
        *l = *r;
        *r = tmp;
        l++;
        r--;
    }
}

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