convert path to unix-like path

cvt_unix_like_path.py

def cvt_unix_like_path(path):
    if path is None:
        return None
    path = str(path)
    unix_p_temp = path.replace('\\', '/')
    unix_p = ''
    pre = ''
    for ch in unix_p_temp:
        if not (ch == '/'):
            unix_p = unix_p + ch
        elif not (pre == '/'):
            unix_p = unix_p + ch
        pre = ch
    return unix_p