How do I add, If s is null, the method should return null. If s is the blank string, “”, the method should return the blank string to my code? import java.util.Scanner; public class replaceFirst     {         public static String replaceFirst(String Str,char c)         {             Str = Str.substring(0,0) + c + Str.substring(0 + 1);// modified string              return Str;                 }     public static void main(String[] args) {        System.out.print( replaceFirst("basant",'c'));     }     }

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