Remove useless code

Author: tan-wei

src/solution/s1674_minimum_moves_to_make_array_complementary.rs

@@ -76,8 +76,6 @@ impl Solution {
 
 #[cfg(test)]
 mod tests {
-    use std::result;
-
     use super::*;
 
     #[test]

src/solution/s1689_partitioning_into_minimum_number_of_deci_binary_numbers.rs

@@ -48,8 +48,6 @@ impl Solution {
 
 #[cfg(test)]
 mod tests {
-    use std::result;
-
     use super::*;
 
     #[test]

src/solution/s1735_count_ways_to_make_array_with_product.rs

@@ -42,8 +42,6 @@ impl Solution {
 
 #[cfg(test)]
 mod tests {
-    use std::result;
-
     use super::*;
 
     #[test]

src/solution/s1742_maximum_number_of_balls_in_a_box.rs

@@ -65,8 +65,6 @@ impl Solution {
 
 #[cfg(test)]
 mod tests {
-    use std::result;
-
     use super::*;
 
     #[test]

src/solution/s1932_merge_bsts_to_create_single_bst.rs

@@ -93,8 +93,6 @@ impl Solution {
 
 #[cfg(test)]
 mod tests {
-    use std::result;
-
     use super::*;
 
     #[test]

src/solution/s1961_check_if_string_is_a_prefix_of_array.rs

@@ -52,8 +52,6 @@ impl Solution {
 
 #[cfg(test)]
 mod tests {
-    use std::result;
-
     use super::*;
 
     #[test]