Fix inconsistent string stream naming

src/BridgeRepair.cpp

@@ -32,7 +32,7 @@ const int BridgeRepair::getPuzzleDay() const
 
 void BridgeRepair::processDataLine(const std::string& line)
 {
-    std::istringstream stringStream{ line };
+    std::istringstream stream{ line };
 
     long long int testValue;
     char colon;
@@ -41,8 +41,8 @@ void BridgeRepair::processDataLine(const std::string& line)
     // The precomputed numbers are used to facilitate the "concatenate" operator.
     std::vector<std::pair<int, int>> calibrationNumbers{};
 
-    stringStream >> testValue >> colon;
-    while (stringStream >> calibrationNumber)
+    stream >> testValue >> colon;
+    while (stream >> calibrationNumber)
     {
         // Skips the precomputation for the first calibration numbers.
         int pow10{ 0 };

src/PlutonianPebbles.cpp

@@ -36,9 +36,9 @@ void PlutonianPebbles::processDataLine(const std::string& line)
     std::shared_ptr<std::map<long long int, long long int>> nextBlinkPebbles;
 
     // Adds initial pebbles numbers.
-    std::istringstream lineStream{ line };
+    std::istringstream stream{ line };
     long long int pebbleNumber;
-    while (lineStream >> pebbleNumber)
+    while (stream >> pebbleNumber)
     {
         addPebble(*currentPebbles, pebbleNumber, 1);
     }

src/PrintQueue.cpp

@@ -89,7 +89,7 @@ void PrintQueue::processOrderingRule(const std::string& line)
 void PrintQueue::processUpdatePages(const std::string& line)
 {
     std::vector<int> pages{};
-    std::stringstream stream{ line };
+    std::istringstream stream{ line };
     std::string token;
     bool isCorrectOrder{ true };
     // We completely construct 'pages' for part 2, even if the ordering is not correct.

src/RedNosedReports.cpp

@@ -35,7 +35,7 @@ void RedNosedReports::processDataLine(const std::string& line)
 {
     RedNosedReportData data{};
 
-    std::stringstream stream{ line };
+    std::istringstream stream{ line };
     std::string token;
     std::getline(stream, token, ' ');
     data.levels.push_back(std::stoi(token));

src/Solver.cpp

@@ -24,14 +24,14 @@ Solver::Solver(const int inputFileNameSuffix)
 
 const std::string Solver::getInputFileName() const
 {
-    std::ostringstream oss;
-    oss << clean(getPuzzleName());
+    std::ostringstream stream;
+    stream << clean(getPuzzleName());
     if (inputFileNameSuffix_ > 0)
     {
-        oss << "_" << inputFileNameSuffix_;
+        stream << "_" << inputFileNameSuffix_;
     }
-    oss << ".txt";
-    return oss.str();
+    stream << ".txt";
+    return stream.str();
 }
 
 long long int Solver::getResultPart1() const