Resolviendo el reto de contenedores

En mi caso el Stack Vertical necesitaba de spacing: 0 para que quede igual que el reto

 VStack(alignment: .trailing, spacing:0){
                Text("1").border(Color.black)
                Text("2").border(Color.black)
                Text("3").border(Color.black)
            HStack(alignment: .top){
                Text("A").frame(width: 100, height: 100, alignment: .center).border(Color.black)
                
                    Text("B").border(Color.black)
                    Text("C").border(Color.black)
                
            }.background(Color.red)
        }.background(Color.blue)

si me salió el reto

VStack(alignment: .trailing){

                Text("1").border(Color.black)
              
                
                Text("2").border(Color.black)
                
               
                Text("3").border(Color.black)
                
             
                
                HStack(alignment:.top ){
                   
                    
                    Text("A").frame(width: 100, height: 100, alignment: .center).border(Color.black)
                     
                    Text("B").border(Color.black)
                   
                    Text("C").border(Color.black)
                    
                }.background(Color.red)
            }.background(Color.blue)
        .frame(width: 200, height: 300, alignment: .center)
    
    
}