chore: use iwyu on bit_manip/**.cpp

Author: realstealthninja

bit_manipulation/find_non_repeating_number.cpp

@@ -15,9 +15,10 @@
  * @author [Ravidev Pandey](https://github.com/literalEval)
  */
 
-#include <cassert>   /// for assert
-#include <iostream>  /// for IO operations
-#include <vector>    /// storing the numbers
+#include <stdint.h>  // for int64_t
+#include <cassert>   // for assert
+#include <iostream>  // for char_traits, basic_ostream, operator<<, cout, endl
+#include <vector>    // for vector
 
 /**
  * @namespace bit_manipulation

bit_manipulation/hamming_distance.cpp

@@ -12,9 +12,11 @@
  * @author [Ravishankar Joshi](https://github.com/ravibitsgoa)
  */
 
-#include <cassert>   /// for assert
-#include <cstdint>   /// for integral typedefs
-#include <iostream>  /// for io operations
+#include <cassert>   // for assert
+#include <cstddef>   // for size_t
+#include <cstdint>   // for uint64_t
+#include <iostream>  // for char_traits, basic_ostream, operator<<, cout, endl
+#include <string>    // for basic_string, string
 
 /**
  * @namespace bit_manipulation

bit_manipulation/travelling_salesman_using_bit_manipulation.cpp

@@ -20,12 +20,11 @@
  * Space complexity: O(n)
  * @author [Utkarsh Yadav](https://github.com/Rytnix)
  */
-#include <algorithm>  /// for std::min
-#include <cassert>    /// for assert
-#include <cstdint>    /// for integral typedefs
-#include <iostream>   /// for IO operations
-#include <limits>     /// for limits of integral types
-#include <vector>     /// for std::vector
+#include <algorithm>  // for min
+#include <cassert>    // for assert
+#include <cstdint>    // for uint64_t, uint32_t
+#include <iostream>   // for operator<<, char_traits, basic_ostream, cout
+#include <vector>     // for vector
 
 /**
  * @namespace bit_manipulation