From e3210f73375dea927863c3063434f8b3c463f7ab Mon Sep 17 00:00:00 2001
From: EntireTwix <willkatz.dev@gmail.com>
Date: Wed, 7 Jul 2021 01:42:41 -0700
Subject: [PATCH] :bug: undeflow check

---
 src/bank.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/bank.cpp b/src/bank.cpp
index b20a231..796314d 100644
--- a/src/bank.cpp
+++ b/src/bank.cpp
@@ -177,7 +177,7 @@ BankResponse Bank::ImpactBal(const std::string &name, int64_t amount) noexcept
     {
         return {k400BadRequest, "\"Amount cannot be 0\""};
     }
-    if (users.modify_if(name, [amount](User &u) { u.balance += amount; }))
+    if (users.modify_if(name, [amount](User &u) { u.balance < (amount*-1)? u.balance = 0 : u.balance += amount; }))
     {
 #if CONSERVATIVE_DISK_SAVE
 #if MULTI_THREADED