[backend]将testdata/下的测例替换为了赛方测试用例，更新了测试脚本

testdata/functional/63_big_int_mul.sy

@@ -0,0 +1,65 @@
+const int len = 20;
+
+int main()
+{
+	int i, j, t, n, temp;
+	int mult1[20] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0};
+	int mult2[20] = {2, 3, 4, 2, 5, 7 ,9 ,9, 0, 1, 9, 8, 7, 6, 4, 3, 2, 1, 2, 2};
+	int len1 = len;
+	int len2 = len;
+	int c1[len + 5];
+	int c2[len + 5];
+	int result[len * 2] = {};
+
+	i = 0;
+	while (i < len1) {
+		c1[i] = mult1[i];
+		i = i + 1;
+	}	
+
+	i = 0;
+	while (i < len2) {
+		c2[i] = mult2[i];
+		i = i + 1;
+	}	
+
+	n = len1 + len2 - 1;
+
+	i = 0;
+	while (i <= n) {
+		result[i]=0;
+		i = i + 1;
+	}	 
+
+	temp=0;
+
+	i = len2 - 1;
+	while (i > -1) {
+		t = c2[i];
+		j = len1 - 1;
+		while (j > -1) {
+			temp = result[n] + t * c1[j];
+			if(temp >= 10) {
+				result[n] = (temp);
+				result[n-1] = result[n-1] + temp / 10;
+			}
+			else
+				result[n] = temp;
+			j = j - 1;
+			n = n - 1;
+		}
+		n = n + len1 - 1;
+		i = i - 1;
+	}
+
+	if(result[0] != 0)
+		putint(result[0]); 
+
+	i = 1;
+	while (i <= len1 + len2 - 1) {
+		putint(result[i]); 
+		i = i + 1;
+	}
+
+	return 0;
+}