Comments: Added

Comments have been added and spacing has been added, for ease of reading

Author: morph-eos

add.h

@@ -5,25 +5,42 @@
 using namespace std;
 
 int add(string numbers) {
+    // Default delimiter is ','
     char delimiter = ',';
+
+    // Check if a custom delimiter is specified
     if (numbers.find("//") == 0) {
         delimiter = numbers[2];
+        // Update numbers to exclude the delimiter specification
         numbers = numbers.substr(4);
     }
+
     int sum = 0;
+    // Create a stringstream from the input string
     stringstream ss(numbers);
     string num, strg;
+
+    // Iterate through each line in the input string
     while (getline(ss, strg, '\n')) {
+        // Create a stringstream for the current line
         stringstream lineStream(strg);
+
+        // Iterate through each number in the line using the specified delimiter
         while (getline(lineStream, num, delimiter)) {
             int currentNum = stoi(num);
+
+            // Check if the current number is negative, and throw an exception if it is
             if (currentNum < 0) {
                 throw runtime_error("negatives not allowed: " + to_string(currentNum));
             }
+
+            // Add the current number to the sum if it is less than or equal to 1000
             if (currentNum <= 1000) {
                 sum += currentNum;
             }
         }
     }
+
+    // Return the sum of valid numbers
     return sum;
 }