Remove Spaces

_ _ _ I t _ _ _ _ i s _ _ a _ a p p l e _ _ => I t _ i s _ a _ a p p l e

Remove Spaces.java

public static String removeSpaces(String input){
    boolean seenGood = false;
    boolean seenSpace = false;
    
    StringBuffer sb = new StringBuffer();
    for(int i = 0; i < input.size(); i++){
        if(input.charAt(i) == " ") seenSpace = true;
        else{
            if(seenGood && seenSpace){
                sb.add(" ");
                seenSpace = false;
            }
            sb.add(input.charAt(i));
            seenGood = true;
        }
    }
    
    return sb.toString();
}