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Strspn

Item Value Header filestring.h Declarationsize_t strspn(const char *str1, const char *str2); Returnreturns the index of the first character in *str1 that does not match any of the characters in *str2. #include <string.h>   #include <stdio.h>   int main(void)   {     int len;     len = strspn("this is a test", "hi");     printf("%d", len);     return 0;   } 0