93. Reverse a String In-Place

#include <stdio.h>

int lenght(char *len)
{
    int temp =0;
    while(*len!='\0')
    {
        temp++;
        len++;
    }

    return temp;
}

void reverse_string(char *str) {
    // Your logic here
    int len = lenght(str); 
    char *left  = str;          // start pointer
    char *right = str + len - 1; // end pointer

    while(left < right)         // stop when they meet
    {
        char temp = *left;
        *left  = *right;
        *right = temp;

        left++;                 // move inward
        right--;                // move inward
    }
}

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;
}