5. Write a method mixlt, that receives 2 strings and returns a string containing the first char of string1, the first char of string2. the second character of string1, the second character of string2 etc. Any leftover chars go at the end of the returned string Example values: mixit("abc", "xyz")returns "axbycz" mixit("Hi", "There") returns "HTihere" mixit("xxxx", "There") returns "xTxhxexre" 6. Write a method doubleChars, that returns a String containing all chars in the received String two times in the returned String. method signature: public static String doubleChars(String str) doubleChars("The") returns "TThhee" // TT for T. hh for h, ee for e doubleChars("AAbb") returns "AAAAbbbb" doubleChars("Hi-There") returns "HHii--TThheerree" doubleChars("") returns doubleChars("") returns