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//strlen
int strlen(char* p)
{
int length = 0, i = 0;
while (*(p + i)) {
length++;
i++;
}
return length;
}
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//strcat
void strcat(char s1[], char s2[])
{
for (int i = strlen(s1); i < strlen(s1) + strlen(s2); i++)
{
s1[i] = s2[i];
}
}