VScodeで読み込んでいないinoファイルも一緒にコンパイルされてしまう。

前提・実現したいこと

2-21.inoというファイルしか読み込んでいないのに、他のinoファイルも一緒にコンパイルされてしまう。

発生している問題・エラーメッセージ

[Starting] Verify sketch - 2-21.ino
[Warning] Output path is not specified. Unable to reuse previously compiled files. Verify could be slow. See README.
構成をロード中…
パッケージを初期化中…
...
c:\Users\a\Dropbox\!Arduino\2-1.ino: In function 'void setup()':

2-1:1:6: error: redefinition of 'void setup()'

 void setup()

      ^~~~~

c:\Users\a\Dropbox\!Arduino\1-7.ino:1:6: note: 'void setup()' previously defined here

 void setup()

      ^~~~~

c:\Users\a\Dropbox\!Arduino\2-1.ino: In function 'void loop()':

2-1:7:6: error: redefinition of 'void loop()'

 void loop()

      ^~~~

c:\Users\a\Dropbox\!Arduino\1-7.ino:8:6: note: 'void loop()' previously defined here

 void loop()

      ^~~~

c:\Users\a\Dropbox\!Arduino\2-20.ino: In function 'void setup()':

2-20:1:6: error: redefinition of 'void setup()'

 void setup()

      ^~~~~

c:\Users\a\Dropbox\!Arduino\1-7.ino:1:6: note: 'void setup()' previously defined here

 void setup()

      ^~~~~

2-20:7:13: error: 'D2' was not declared in this scope

     pinMode(D2,INPUT_PULLUP);

             ^~

c:\Users\a\Dropbox\!Arduino\2-20.ino:7:13: note: suggested alternative: 'A2'

     pinMode(D2,INPUT_PULLUP);

             ^~

             A2

2-20:17:21: error: 'mills' was not declared in this scope

     while (e_time = mills(), e_time - s_time < 10000)

                     ^~~~~

c:\Users\a\Dropbox\!Arduino\2-20.ino:17:21: note: suggested alternative: 'millis'

     while (e_time = mills(), e_time - s_time < 10000)

                     ^~~~~

                     millis

c:\Users\a\Dropbox\!Arduino\2-20.ino: In function 'void loop()':

2-20:42:6: error: redefinition of 'void loop()'

 void loop()

      ^~~~

c:\Users\a\Dropbox\!Arduino\1-7.ino:8:6: note: 'void loop()' previously defined here

 void loop()

      ^~~~

c:\Users\a\Dropbox\!Arduino\2-21.ino: In function 'void setup()':

2-21:1:6: error: redefinition of 'void setup()'

 void setup()

      ^~~~~

c:\Users\a\Dropbox\!Arduino\1-7.ino:1:6: note: 'void setup()' previously defined here

 void setup()

      ^~~~~

c:\Users\a\Dropbox\!Arduino\2-21.ino: In function 'void loop()':

2-21:7:6: error: redefinition of 'void loop()'

 void loop()

      ^~~~

c:\Users\a\Dropbox\!Arduino\1-7.ino:8:6: note: 'void loop()' previously defined here

 void loop()

      ^~~~

c:\Users\a\Dropbox\!Arduino\while.ino: In function 'void setup()':

while:1:6: error: redefinition of 'void setup()'

 void setup() {

      ^~~~~

c:\Users\a\Dropbox\!Arduino\1-7.ino:1:6: note: 'void setup()' previously defined here

 void setup()

      ^~~~~

while:8:11: error: 'D2' was not declared in this scope

   pinMode(D2, INPUT_PULLUP); // 2番ピンを入力用にする

           ^~

c:\Users\a\Dropbox\!Arduino\while.ino:8:11: note: suggested alternative: 'A2'

   pinMode(D2, INPUT_PULLUP); // 2番ピンを入力用にする

           ^~

           A2

while:21:13: error: a function-definition is not allowed here before '{' token

 void loop() {

             ^

c:\Users\a\Dropbox\!Arduino\while.ino:3:25: warning: unused variable 'e_time' [-Wunused-variable]

   unsigned long s_time, e_time;

                         ^~~~~~

c:\Users\a\Dropbox\!Arduino\while.ino:5:11: warning: unused variable 'is_break' [-Wunused-variable]

   boolean is_break = false;

           ^~~~~~~~

...