93. Reverse a String In-Place

#include <stdio.h>

void reverse_string(char *str) {
    int left = 0;
    int right = 0;
    int max = 0;
    while(str[right++] != '\0');
    right -= 2; // '\0'

    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;
}