Use strspn() and strcspn() for String Span Operations

Use strspn() and strcspn() for String Span Operations

The strspn() function finds the length of the initial segment of a string that consists entirely of characters contained in a given mask. Conversely, strcspn() finds the length of the initial segment that does not contain any of the characters in a given mask. These functions are useful for parsing and validating strings.

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