CC1.2(Reverse)

reverse.c

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

void reverse(char* str);

int main(){
    char* str = malloc(256);
    strcpy(str, "this is for test");
    printf("%s\n",str);
    reverse(str);
    printf("%s\n", str);
    free(str);
    return 0;
}

void reverse(char* str) {
    int len = strlen(str);
    int i = 0;
    char temp;
    for(i = 0; i < (len+1)/2 ; i++) {
        temp = str[i];
        str[i] = str[len - 1 - i];
        str[len - 1 - i] = temp;
    }
}

thanks for your comments in https://gist.github.com/asdw3276/39b2a443c62773fca357 ~
But string in java is immutable, so i have to create a new string and return this new string.