refactor: remove function prototypes from binary search files

Author: ongshunping

cpp/Binary Search/cutting_wood.cpp

@@ -1,9 +1,6 @@
 #include <vector>
 #include <algorithm>
 
-// Function prototype
-bool cutsEnoughWood(int H, int k, std::vector<int>& heights);
-
 int cuttingWood(std::vector<int>& heights, int k) {
     int left = 0;
     int right = *std::max_element(heights.begin(), heights.end());

cpp/Binary Search/first_and_last_occurrences_of_a_number.cpp

@@ -1,9 +1,5 @@
 #include <vector>
 
-// Function prototypes
-int lowerBoundBinarySearch(std::vector<int>& nums, int target);
-int upperBoundBinarySearch(std::vector<int>& nums, int target);
-
 std::vector<int> firstAndLastOccurrencesOfANumber(std::vector<int>& nums, int target) {
     int lowerBound = lowerBoundBinarySearch(nums, target);
     int upperBound = upperBoundBinarySearch(nums, target);