pls help this replaceSubstring method occured error... public static String repl

Question

pls help this replaceSubstring method occured error...

public static String replaceSubstring(String str1, String str2, String str3)
   {
str1 += "";
char[] array = str1.toCharArray();
String position = new String();

String newStr = "";

StringBuilder strb = new StringBuilder(str1);
for( int i = 0; i < array.length; i++)
{
   if(array[i] != ' ')
   {
position += array[i];
   }
   else
   {
if(position.equals(str2))
{
   int first = i - position.length();
   strb.replace(first, i, str3 );
   newStr = strb.toString();
   }
position = new String();
   }
}
return newStr;

   }

output:

Explanation / Answer

What was input?

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