How do I convert my void return type clear function to string return type.

public class stringtowords 
{  
	public static void Clear(String s)
	{
		String wo[]=s.split(" ");
	       for(String w:wo)
	      {
	    	  System.out.println(w);
	      }
	       System.out.println("clear words i.e. after ignoring special characters and no. and converting all to small letters are:");
	      	
	      String word;
	       for(int i=0;i<wo.length;i++)
	       { 
	    	   word=wo[i].toLowerCase();
	    	    List<Character> li=new ArrayList<Character>(); 
	    	    for (char ch:word.toCharArray())
	    	      if(ch>='a' && ch<='z')
	    	      li.add(ch);
	    	    String ss="";
	    	    for(char ch:li)
	    	    ss=ss+ch;
	    	    
	    	    System.out.println(ss);
	      }
	}
	public static void main(String args[])
	{
	   String s="Hello! my my Name@ is Pragya12";
       Clear(s);
      // System.out.println(g);
       
     }    
}