static int minimumDistance(String[] wordArray, String word1, String word2){
        int minDistance = Integer.MAX_VALUE;
        if(word1 != null && word2 != null){
            int index1 = -1;
            int index2 = -1;
            for(int i=0; i<wordArray.length; i++){
                if(word1.equals(wordArray[i]))
                    index1 = i; 
                
                if(word2.equals(wordArray[i]))
                    index2 = i;

                if(index1 != -1 && index2 != -1){
                    int dist = Math.abs(index1 - index2);
                    minDistance = Math.min(dist, minDistance);
                }
            }
        }
        return minDistance;
    }