ft_strcspn

Assignment name	: ft_strcspn
Expected files	: ft_strcspn.c
Allowed functions: None
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Reproduce exactly the behavior of the function strcspn
(man strcspn).

The function should be prototyped as follows:

size_t	ft_strcspn(const char *s, const char *reject);

#include <string.h>

size_t strcspn(const char* str1, const char* str2);