int  str_len(char* str);
char* str_copy(char* str, char* dst);
char* str_cat(char* str, char* str2);
int str_ch(char* str, char ch);
int sum_of_digits(char* str);
int sum_of_decimal(char* str);

int main()
{
	char ch = 'm';
	const int size = 20;
	char str[size] = "tema";
	char str1[size] = "zenya";
	char str2[size] = " bbik123zenya435h23";

	/*char dst[size];*/
	/*str_copy(str, dst);
	printf ("dst:%s\n", dst );*/
	/*printf("dst:%s\n", str_copy(str2, dst));
	printf("str len: %d\n", str_len(str));
	printf("str2 len: %d\n", str_len(str2));
	str_cat(str1, str2);
		printf("str1: %s\n", str1);*/
	printf("i: %d\n", str_ch(str1, ch));
	printf("sum: %d\n", sum_of_digits(str2));
	printf("sum2: %d\n", sum_of_decimal(str2));

}


int  str_len(char* str)
{
	int i = 0;
	while (str[i])
	{
		i++;
	}
	return i;
}

char* str_copy(char* str, char* dst)
{
	int i = 0;
	while (str[i])
	{
		dst[i] = str[i];
		i++;
	}
	dst[i] = '\0';
	return dst;
}
char* str_cat(char* str1, char* str2)
{
	int len1 = str_len(str1);
	int i = 0;
	while (str2[i])
	{
		str1[i + len1] = str2[i];
		i++;
	}
	str1[i + len1] = '\0';
	return str1;
}
int  str_ch(char* str, char ch)
{
	int i = 0;
	while (str[i])
	{
		if (str[i] == ch)
		{
			return i;
		}
		i++;
	}
	return -1;

}
int sum_of_digits(char* str)
{
	int i = 0, sum = 0;
	while (str[i])
	{
		if (str[i] >= '0'&& str[i] <= '9')
		{
			sum += str[i] - '0';
		}
		i++;
	}
	return sum;
}
int sum_of_decimal(char* str)
{
	int i = 0, sum = 0, current = 0;
	while (str[i])
	{
		printf("i:%d\n", i);
		if (str[i] >= '0'&& str[i] <= '9')
		{
			current = current * 10 + str[i] - '0';
			/*i++;*/
			printf("str:%s,current:%d\n", str, current);
		}
		else
		{sum += current;
		current = 0;
		}
		i++;

		printf("sum: %d\n", sum);

	}
sum += current;
	return sum;
}