class Solution {
    public String reversePrefix(String word, char ch) {
        char[] letters=word.toCharArray();
        int index=-1;
        char temp;
        for(int i=0; i<letters.length; i++){
            if(letters[i]==ch){
                index=i;
                for(int j=0; j<(index+1)/2; j++){
                    temp=letters[j];
                    letters[j]=letters[index-j];
                    letters[index-j]=temp;
                }
                break;
            }
        }
        
        return String.valueOf(letters);
    }
}