refactor snake case

src/io.cpp

@@ -1,14 +1,14 @@
 #include "io.h"
 #include <iostream>
 
-int readNumber()
+int read_number()
 {
     std::cout << "Enter a number to add: ";
     int x{};
     std::cin >> x;
     return x;
 }
-void writeAnswer(int x)
+void write_answer(int x)
 {
     std::cout << "The answer is: " << x << "\n";
 }

src/io.h

@@ -1,4 +1,4 @@
 #pragma once
 
-int readNumber();
-void writeAnswer(int x);
+int read_number();
+void write_answer(int x);

src/main.cpp

@@ -5,8 +5,8 @@
 int main()
 {
 
-    int a{readNumber()};
-    int b{readNumber()};
-    writeAnswer(a + b);
+    int a{read_number()};
+    int b{read_number()};
+    write_answer(a + b);
     return 0;
 }