Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    int j =0; 
    int index =0; 
    while (str[index]!='\0'){ 
        index++;
    }
    index--;
    while (index>j) {
        char temp = str[j];
        str[j]=str[index];
        str[index]=temp; 
        j++;
        index--;
    }
}

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