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Synopsis

char *strtok(char * restrict s1,
const char * restrict s2);

The first call in the sequence searches the string pointed to by s1 for the first character
that is not contained in the current separator string pointed to by s2. If no such character
is found, then there are no tokens in the string pointed to by s1and the strtok function
returns a null pointer. If such a character is found, it is the start of the first token.