Made the changes and added c file

Optimization Algorithms/Best Time To Buy and Sell/Programbest.c

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+#include <stdio.h>
+
+int maxProfit(int* prices, int pricesSize) {
+    if (pricesSize <= 1) return 0; // No profit can be made
+
+    int minPrice = prices[0]; // Initialize minPrice to the first price
+    int maxProfit = 0; // Initialize maxProfit to 0
+
+    for (int i = 1; i < pricesSize; i++) {
+        // Update minPrice if the current price is lower
+        if (prices[i] < minPrice) {
+            minPrice = prices[i];
+        } else {
+            // Calculate profit if we sell at the current price
+            int profit = prices[i] - minPrice;
+            if (profit > maxProfit) {
+                maxProfit = profit; // Update maxProfit if the current profit is higher
+            }
+        }
+    }
+
+    return maxProfit; // Return the maximum profit found
+}
+
+int main() {
+    int prices[] = {7, 1, 5, 3, 6, 4}; // Example prices
+    int size = sizeof(prices) / sizeof(prices[0]);
+
+    int result = maxProfit(prices, size);
+    printf("The maximum profit is: %d\n", result);
+
+    return 0;
+}