Some comments. minor changes and a Makefile

Makefile

@@ -0,0 +1,48 @@
+#
+# Snel makefile
+#
+# 	 Author: Christos Choutouridis AEM:8997
+#	 email:  cchoutou@ece.auth.gr
+#
+
+CXX      := -c++
+CXXFLAGS := -std=c++14 -Wall -Wextra -Werror
+LDFLAGS  := -lstdc++
+BUILD    := ./bin
+OBJ_DIR  := $(BUILD)/obj
+APP_DIR  := $(BUILD)
+TARGET   := snel
+SRC      := $(wildcard src/*.cpp)
+
+OBJECTS := $(SRC:%.cpp=$(OBJ_DIR)/%.o)
+
+$(OBJ_DIR)/%.o: %.cpp
+	@mkdir -p $(@D)
+	$(CXX) $(CXXFLAGS) -o $@ -c $<
+
+$(APP_DIR)/$(TARGET): $(OBJECTS)
+	@mkdir -p $(@D)
+	$(CXX) $(CXXFLAGS) $(LDFLAGS) -o $(APP_DIR)/$(TARGET) $(OBJECTS)
+
+# === Rules ===
+snel: build $(APP_DIR)/$(TARGET)
+
+build:
+	@mkdir -p $(APP_DIR)
+	@mkdir -p $(OBJ_DIR)
+
+debug: CXXFLAGS += -DDEBUG -g3
+debug: snel
+
+release: CXXFLAGS += -O2
+release: snel
+
+all: release
+
+clean:
+	-@rm -rvf $(OBJ_DIR)/*
+	-@rm -rvf $(APP_DIR)/*
+
+.PHONY: snel build debug release all clean
+
+