':param str_in: The input parameter to "repr()"
:return: The repr\'ed string'

def _repr(self, str_in):

    res = ''
    for c in str_in:
        if ((repr(c)[1:(-1)] != c) and (c not in ['\n', '\r', ' DCTB '])):
            res += repr(c)[1:(-1)]
        else:
            res += c
    return res
