/**
  * Test the Bitcoin::remove0x() function.
  */
 public function testRemove0x()
 {
     $this->assertEquals(Bitcoin::remove0x("abcdefg"), "abcdefg");
     $this->assertEquals(Bitcoin::remove0x("0xabcdefg"), "abcdefg");
     $this->assertEquals(Bitcoin::remove0x("0Xabcdefg"), "abcdefg");
 }