allStar - Recursive - Java & C#

Given a string, compute recursively a new string where all the adjacent chars are now separated by a "*".

allStar("hello") → "h*e*l*l*o"
allStar("abc") → "a*b*c"
allStar("ab") → "a*b"
Java :

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public static String allStar(String str) { //Stop Condition if(str.length()<1) return ""; if(str.length() == 1) return str+"*"; //Main recursive process return str.charAt(0)+"*"+allStar(str.substring(1)); }

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C# :

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public static string allStar(String str) { //Kondisi stop if (str.Length < 1) return ""; if (str.Length == 1) return str; //Proses rekursif return str[0] + "*" + allStar(str.Substring(1)); }

Hasil :