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int strcmp(char const * a, char const * b)
{
while (*a || *b)
{
if (*a<*b)
return -1;
else if (*a>*b)
return 1;

++a;
++b;
}
return 0;
}

void strcpy(char * dest, char const * src)
{
while (*dest++=*src++);
}

int strlen(char const * a)
{
int count;
for (count=0; *a; ++a,++count);
return count;
}

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