#include "isogram.h"
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <memory.h>
#define NULL ((void*)0)

bool is_isogram(const char phrase[])
{
    bool bOgram = false; 
    if(phrase==NULL) 
    {
        bOgram = true; 
        goto End;
    }
    char *pPhrase = NULL;
    if(phrase[0]=='\0')
        goto End;  
    
    int len = strlen(phrase);
    if(len<2)
        goto End;
    
    pPhrase = (char * )malloc(len*sizeof(char));
    for(int i=0;i<len;i++)
    {
       pPhrase[i] = tolower( phrase[i]); 
    }
    for(int i=0;i<len;i++)
    { 
        for(int j=i+1;j<len;j++)
        {
            if(pPhrase[i]==pPhrase[j])
            {
                goto FREE;
            }
        }
    }   
    bOgram = true;
FREE:
    free(pPhrase);
End:
    return bOgram;
}