Implement strstr(string, pattern, err)
Where you want to find out whether the pattern occurs in string,
allowing upto err number of errors in matching.
Let ABC be the pattern to match, and let err be 1
Where an error is :
a. omission : i.e. even AB should match
b. replacement : i.e. even AXC would match
c. addition : i.e. even ABXD would match
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