93. Reverse a String In-Place

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    if(str == NULL)
        return;
    
    char *end = str, *start = str;
    char temp = '0';
    while(*end != '\0')
        end++;

    if(end == str)
        return;

    end--;
    while(start < end)
    {
        temp = *(start);
        *(start) = *(end);
        *(end) = temp;
        start++;
        end--;
    }
}

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;
}