#include <stdio.h>
#include <string.h>
 
int counts(char * s, const char * m)
{
    const char * delimeters = " ,.\t:;\"\'"; // Все, что разделяет слова :)
    int cnt = 0;
    for(s = strtok(s,delimeters);s;s = strtok(0,delimeters))
        if (!strcmp(s,m)) ++cnt;
    return cnt;
}
 
 
int main(int argc, const char * argv[])
{
    char s[] = "Tom, Tom, and Tom went to the river.";
 
    printf("There are %d \"Tom\" in string\n",counts(s,"Tom"));
 
}
 

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