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strDist challenge


I am working on below challenge.
Psedo code:
1. find length of str starting and ending with sub.
2. return the length

I wrote my code as below and not passing all tests
public int strDist(String str, String sub) {
   if (str.length() <2){ 
	    	return 0;
	    if (str.startsWith( sub) {
	    	return 1 + strDist(str.substring(2));
	    	else {
		   return strDist(str.substring(1));

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i am getting below error

Compile problems:

Error:      return 1 + strDist(str.substring(2));
The method strDist(String, String) in the type Shell is not applicable for the arguments (String)

see Example Code to help with compile problems
Any improvements or alternate approaches?      

please advise
JavaJava EEProgramming

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8/22/2022 - Mon