app/src/main/res/drawable/straighten.xml

<vector
    android:height="24dp"
    android:tint="?android:textColorPrimary"
    android:viewportHeight="24"
    android:viewportWidth="24"
    android:width="24dp"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <path
        android:fillColor="?android:textColorPrimary"
        android:pathData="M21,6L3,6c-1.1,0 -2,0.9 -2,2v8c0,1.1 0.9,2 2,2h18c1.1,0 2,-0.9 2,-2L23,8c0,-1.1 -0.9,-2 -2,-2zM21,16L3,16L3,8h2v4h2L7,8h2v4h2L11,8h2v4h2L15,8h2v4h2L19,8h2v8z"/>

</vector>