Convert hangul to english. ('한영타' -> 'gksdudxk')
    :param string: hangul that actually represent english string
    :return: converted english string

def h2e(string):
    """
    Convert hangul to english. ('한영타' -> 'gksdudxk')
    :param string: hangul that actually represent english string
    :return: converted english string
    """
    result = []
    for c in string:
        ccode = ord(c)  # Character code

        if 0x3131 <= ccode <= 0x3163:  # Hangul Compatibility Jamo
            result.append(H2E_MAPPING[c])
        elif 0xAC00 <= ccode <= 0xD7A3:  # Hangul Syllables
            ccode -= 0xAC00
            # decompose hangul
            lead = JA_LEAD[ccode // 588]
            medi = MO[(ccode % 588) // 28]
            tail = JA_TAIL[(ccode % 588) % 28]
            result.append(H2E_MAPPING[lead])
            result.append(H2E_MAPPING[medi])
            result.append(H2E_MAPPING[tail])
        else:  # Rest of all characters
            result.append(c)
    return ''.join(result)