troubleshooting Question

pairstar challenge

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gudii9Flag for United States of America asked on
Java EEJava
2 Comments1 Solution417 ViewsLast Modified:

I am working on below challenge.
Psedo code:
1. check the array length 0  or 1 then retun same str
2.else return string with * in between for repeated pair of characters

I wrote my code as below and not passing all tests
public String pairStar(String str) {
    return str;
  return str.charAt(0)+"*"+pairStar(str.substring(1));


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Expected      Run            
pairStar("hello") → "hel*lo"      "h*e*l*l*o"      X      
pairStar("xxyy") → "x*xy*y"      "x*x*y*y"      X      
pairStar("aaaa") → "a*a*a*a"      "a*a*a*a"      OK      
pairStar("aaab") → "a*a*ab"      "a*a*a*b"      X      
pairStar("aa") → "a*a"      "a*a"      OK      
pairStar("a") → "a"      "a"      OK      
pairStar("") → ""      ""      OK      
pairStar("noadjacent") → "noadjacent"      "n*o*a*d*j*a*c*e*n*t"      X      
pairStar("abba") → "ab*ba"      "a*b*b*a"      X      
pairStar("abbba") → "ab*b*ba"      "a*b*b*b*a"      X      
other tests

Any improvements or alternate approaches?      

please advise

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