Reverse a String In-Place

Code

#include <stdio.h>

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

    size_t len = 0;
    while (*temp) { 
        len++;
        temp++;
    }

    size_t i = 0;
    size_t j = len - 1;

    while (i < j) {
        char temp_ = str[i];
        str[i] = str[j];
        str[j] = temp_;

        i++;
        j--;
    }
}

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