Horse[] spaces;
/** Returns the index of the space that contains the horse with the specified name.
 * Precondition: No two horses in the barn have the same name.
 * @param name the name of the horse to find
 * @return the index of the space containing the horse with the specified name;
 * -1 if no horse with the specified name is in the barn.
 */
 public int findHorseSpace(String name){
    int out=-1;
    for(int i=0; i<spaces.length; i++){
        Horse h=spaces[i];
        if(h!=null&&h.getName().equals(name)){
            out=i;
        }
    }
    return out;
 }

 public int findHorseSpace(String name){
    for(int i=0; i<spaces.length; i++){
        if(spaces[i]!=null&&spaces[i].getName().equals(name)){
            return i;
        }
    }
    return -1;
 }

 public int findHorseSpace(String name){
    for(int i=0; i<spaces.length; i++){
        if(spaces[i]!=null){
            if(spaces[i].getName().equals(name)){
                return i;
            }
        }
    }
    return -1;
 }

 public int findHorseSpace(String name){
    int out=-1;
    while(out<0){
        Horse h=spaces[i];
        if(h!=null&&h.getName().equals(name)){
            out=i;
        }
    }
    return out;
 }