I want to implement a check function that given two strings s1
and s2
will check if s2
is the caesar cipher of s1
or not. the inter face needs to be looked like string->string->bool
.
the problem is that I am not allowed to use any string functions other than String.length
, so how can I solve it? i am not permitted any list array
, iterations
. Only recursions
and pattern matching
.
Please help me. And also can you tell me how I can write a substring function in ocaml other than the module function with the above restrictions?
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