refactoring: comment a function and rename a variable

src/main/c/Georg/tictactoe.c

@@ -80,11 +80,10 @@ char* getUserInput(){
     printf( ":" );
     fgets(userInput, sizeof(userInput), stdin);
 
-    size_t len = strlen(userInput);
-    if (len > 0 && userInput[len - 1] == '\n') {
-        userInput[len - 1] = '\0';
+    size_t lengthOfInput = strlen(userInput);
+    if (lengthOfInput > 0 && userInput[lengthOfInput - 1] == '\n') {
+        userInput[lengthOfInput - 1] = '\0'; // declare end of command
     }
-
     return userInput;
 }