Write java code that completes the following task

/** * Convert a String containing ASCII characters representing a number in * hex into a String containing ASCII characters that represent that same * value in binary. * * The output string should only contain numbers. * You do not need to handle negative numbers. * The length of all the hex strings passed in will be of size 8. So 32 in binary. * Only API methods you can use are String.length() and String.charAt() * * Example: hexToBinStr("06A1E4C0"); // => 00000110101000011110010011000000 * * You may declare one String variable in this method.