93. Reverse a String In-Place

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    //1. find the array length
    int len = 0;
    int i = 0;
    while(*(str + i) != '\0')
    {
        len++;
        i++;
    }

    //2. Start two pointers
    int l = 0;
    int r = len - 1;

    //3. swap pointers while moving
    while(l < r)
    {
        char temp = *(str + l);
        *(str + l) = *(str + r);
        *(str + r) = temp;

        l++;
        r--;
    }
}

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;
}