add ctc inference code (#1806)

zhifu gao

2024-06-11 997374b88fe6b2ae5cb4dcaf47d78cb3eff09fc2

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.