refactoring: added descriptions for main function

src/main.c

@@ -7,9 +7,11 @@ char buffer[100];
 int main() {
     printf("Please enter the id of a specific operation...\n1. addition\n2. subtraction\n3. multiplication\n4. division\n");
 
+    // input for math operation as integer
     int input;
     scanf("%d", &input);
 
+    // check if operation input is valid
     if(!checkOperationInput(input)) {
         printf("Invalid operation id\n");
         return 0;
@@ -17,6 +19,7 @@ int main() {
 
     printf("\nPlease enter the first and the second number separated by a space...\n");
 
+    // loop to enter numbers for calculation
     while(fgets(buffer, 100, stdin)) {
         buffer[strcspn(buffer, "\n")] = '\0';
         if (strlen(buffer) > 0) {
@@ -24,6 +27,7 @@ int main() {
         }
     }
 
+    // extracting numbers from input
     int* result = evaluateInput(buffer, input);
 
     if(result == NULL) {