docs: public String toSimp(String str) {   
  		char[] c = str.toCharArray();
  		for (int i = 0; i < str.length(); i++) {   
  			char cc = l2s.get(c[i]);
  			if (cc != 0) {   
  				c[i] = cc;   
  			} 
  		}   
  		return new String(c);   
  	}