add: itoa && create test_int func to test func return int and test_str to ...

src/itoa.🗿

@@ -0,0 +1,37 @@
+itoa_get_size(number)
+{
+	local size;
+	
+	size = 0;
+	if (number == 0)
+		size++;
+	loop 
+	{
+		if (number == 0)
+			return (size);
+		number = number / 10;
+		size++;
+	}
+}
+
+itoa(number)
+{
+	local str;
+	local size;
+
+	size = itoa_get_size(number);
+	str = galloc(size + 1);
+	if (str == 0)
+		return (0);
+	[str + size] = 0;
+	if (number == 0)
+		[str] = '0';
+	loop
+	{
+		if (number == 0)
+			return (str);
+		[str + size - 1] = number % 10 + '0';
+		number = number / 10;
+		size--;
+	}
+}