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String str1 = '00000120345';
String str2 = '43579034';


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Java code:
public static void main(String[] args) {
String str1 = "00000120345";
str1 = removeStartZero(str1);
System.out.println(str1);
}

public static String removeStartZero(String str) {
while (str.startsWith("0")) {
str = str.substring(1);
}
return str;
}

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