Android Remove zero from stating in string

Helper.java

public static String removeZero(String str) 
    { 
        // Count leading zeros 
        int i = 0; 
        while (str.charAt(i) == '0') 
            i++; 
  
        // Convert str into StringBuffer as Strings 
        // are immutable. 
        StringBuffer sb = new StringBuffer(str); 
  
        // The  StringBuffer replace function removes 
        // i characters from given index (0 here) 
        sb.replace(0, i, ""); 
  
        return sb.toString();  // return in String 
    }