CodingBat/Java/Recursion-1/StringClean.java at master · pauldpearson/CodingBat · GitHub

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Given a string, return recursively a "cleaned" string where adjacent chars that are the same have been reduced to a single char. So "yyzzza" yields "yza".
stringClean("yyzzza") → "yza"
stringClean("abbbcdd") → "abcd"
stringClean("Hello") → "Helo"
public class StringClean {