Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    int length = 0;
    while(str[length] != '\0'){
        length++;
    }

    int left = 0;
    int right = length - 1;
    while(left < right){
        char temp = str[left];
        str[left] = str[right];
        str[right] = temp;

        left++;
        right--;
    }
}

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