#include<stdio.h>
#include<stdlib.h>
#include<limits.h>
#include<string.h>

void reverseString(char *str){
    int length = strlen(str);
    char *start = str;
    char *end = str + length - 1;
    while(start < end){
        char temp = *start;
        *start = *end;
        *end = temp
        start++;
        end--;
    }
}