[Wiring Help Needed] How to wire 2 LED strips to 1 Arduino Nano with I/O switch?

  // these are the bar colors two pixel sets
  //  base[0] = base[1] = CRGB::Yellow;  //custom colors
  //  base[2] = base[3] = CRGB::White;
  // base[4] = base[5] =  CRGB::Yellow;

  // these are the bar colors single pixel sets
  base[0] =  CRGB::Yellow;  //custom colors
  base[1] = CRGB::White;
  base[2] =  CRGB::Yellow;

  // these are the bar colors two pixel sets
  //  base[0] = base[1] = CRGB::Yellow;  //custom colors
  //  base[2] = base[3] = CRGB::White;
  // base[4] = base[5] =  CRGB::Yellow;

  // these are the bar colors single pixel sets
  base[0] =  CRGB::Yellow;  //custom colors
  base[1] = CRGB::White;
  base[2] =  CRGB::Yellow;

A "CRGB" is an object representing a color in RGB color space. It contains simply:

    a one byte value (0-255) representing the amount of red,
    a one byte value (0-255) representing the amount of green,
    a one byte value (0-255) representing the amount of blue in a given color.

A "CRGB" is an object representing a color in RGB color space. It contains simply:

    a one byte value (0-255) representing the amount of red,
    a one byte value (0-255) representing the amount of green,
    a one byte value (0-255) representing the amount of blue in a given color.

CRGB  mycyan = {0, 255, 127};

CRGB  mycyan = {0, 255, 127};

void turnon()
{
  for ( int y=0; y <NUM_LEDS;y++ )
  {

   leds[y] = mycyan  ;
   FastLED.delay(5); 
   FastLED.show();  
  }

void turnon()
{
  for ( int y=0; y <NUM_LEDS;y++ )
  {

   leds[y] = mycyan  ;
   FastLED.delay(5); 
   FastLED.show();  
  }

void turnon()
{
  for ( int y=0; y <NUM_LEDS;y++ )
  {

   leds[y] = mycyan  ;
   FastLED.delay(5); 

  }
}

void turnon()
{
  for ( int y=0; y <NUM_LEDS;y++ )
  {

   leds[y] = mycyan  ;
   FastLED.delay(5); 

  }
}

#define BLOCK_SIZE 4 // size of the block pixels

#define BLOCK_SIZE 4 // size of the block pixels

CRGB block[BLOCK_SIZE ];

CRGB block[BLOCK_SIZE ];

   block[0] = CRGB::Yellow;
   block[1] = CRGB::Yellow;
   block[2] = CRGB::White;
   block[3] = CRGB::Yellow;
   block[4] = CRGB::Yellow;

   block[0] = CRGB::Yellow;
   block[1] = CRGB::Yellow;
   block[2] = CRGB::White;
   block[3] = CRGB::Yellow;
   block[4] = CRGB::Yellow;

#define FRAMES_PER_SECOND 120
#define START_SPEED 100

#define FRAMES_PER_SECOND 120
#define START_SPEED 100

#include "FastLED.h"
#define leds1PIN 8
#define leds2PIN 9
#define LED_TYPE WS2811
#define COLOR_ORDER GRB
#define NUM_LEDS 64
#define FRAMES_PER_SECOND 120
#define START_SPEED 1
#define BLOCK_SIZE 6

CRGB leds [NUM_LEDS + BLOCK_SIZE ];  // space on the end to CRGB base[BLOCK_SIZE ];

// full bright cyan
CHSV  mycyan = {145,255,255};
// full bright yellow
CHSV  myyellow = rgb2hsv_approximate(CRGB::Yellow);
// full bright white
CHSV  mywhite = rgb2hsv_approximate(CRGB::White);

#define RATE 10 //how fast block pattern moves (smaller =faster)
#define RATE_WAIT 3000 // between pulses
uint8_t pos = 0;  // position along strip
uint8_t start_block_element=0;  // position along block

void turnon()
{
  for ( int y=0; y <NUM_LEDS;y++ )
  {
   leds[y] = mycyan  ;
   FastLED.delay(START_SPEED); 
  }
}

void initial_pattern()
{
while  (pos < NUM_LEDS + BLOCK_SIZE )
  {
  EVERY_N_MILLISECONDS(RATE) 
    {
    start_block_element=0;
   // if starting not all block is shown
   if ( pos < BLOCK_SIZE )
    {
      start_block_element =BLOCK_SIZE-(pos); 
    }
    for ( uint8_t t= start_block_element; t < BLOCK_SIZE; t++)
      {
         leds[pos +(t-BLOCK_SIZE)] = base[t];
      }
     pos++;  
  }
   FastLED.show();  // Display the pixels.
   }
}

void setup() {
    mycyan.v = mycyan.v *.2;  // set bright
    myyellow.v = myyellow.v *.5;  // half bright
    mywhite.v = mywhite.v *.5;  // half bright

FastLED.addLeds<WS2812,leds1PIN,COLOR_ORDER >(leds,NUM_LEDS);
FastLED.addLeds<WS2812,leds2PIN,COLOR_ORDER >(leds,NUM_LEDS);

  // change BLOCK_SIZE to suit
  base[0]  = mycyan;  // end of pattern - 
  base[1] =  myyellow;
  base[2] =  myyellow;
  base[3] =  mywhite;
  base[4] =  myyellow;
  base[5] =  myyellow;

turnon();
initial_pattern();
}

void loop() {
 EVERY_N_MILLISECONDS(RATE_WAIT) 
 {
  pos=0;
  initial_pattern();
 }
}

#include "FastLED.h"
#define leds1PIN 8
#define leds2PIN 9
#define LED_TYPE WS2811
#define COLOR_ORDER GRB
#define NUM_LEDS 64
#define FRAMES_PER_SECOND 120
#define START_SPEED 1
#define BLOCK_SIZE 6

CRGB leds [NUM_LEDS + BLOCK_SIZE ];  // space on the end to CRGB base[BLOCK_SIZE ];

// full bright cyan
CHSV  mycyan = {145,255,255};
// full bright yellow
CHSV  myyellow = rgb2hsv_approximate(CRGB::Yellow);
// full bright white
CHSV  mywhite = rgb2hsv_approximate(CRGB::White);

#define RATE 10 //how fast block pattern moves (smaller =faster)
#define RATE_WAIT 3000 // between pulses
uint8_t pos = 0;  // position along strip
uint8_t start_block_element=0;  // position along block

void turnon()
{
  for ( int y=0; y <NUM_LEDS;y++ )
  {
   leds[y] = mycyan  ;
   FastLED.delay(START_SPEED); 
  }
}

void initial_pattern()
{
while  (pos < NUM_LEDS + BLOCK_SIZE )
  {
  EVERY_N_MILLISECONDS(RATE) 
    {
    start_block_element=0;
   // if starting not all block is shown
   if ( pos < BLOCK_SIZE )
    {
      start_block_element =BLOCK_SIZE-(pos); 
    }
    for ( uint8_t t= start_block_element; t < BLOCK_SIZE; t++)
      {
         leds[pos +(t-BLOCK_SIZE)] = base[t];
      }
     pos++;  
  }
   FastLED.show();  // Display the pixels.
   }
}

void setup() {
    mycyan.v = mycyan.v *.2;  // set bright
    myyellow.v = myyellow.v *.5;  // half bright
    mywhite.v = mywhite.v *.5;  // half bright

FastLED.addLeds<WS2812,leds1PIN,COLOR_ORDER >(leds,NUM_LEDS);
FastLED.addLeds<WS2812,leds2PIN,COLOR_ORDER >(leds,NUM_LEDS);

  // change BLOCK_SIZE to suit
  base[0]  = mycyan;  // end of pattern - 
  base[1] =  myyellow;
  base[2] =  myyellow;
  base[3] =  mywhite;
  base[4] =  myyellow;
  base[5] =  myyellow;

turnon();
initial_pattern();
}

void loop() {
 EVERY_N_MILLISECONDS(RATE_WAIT) 
 {
  pos=0;
  initial_pattern();
 }
}

// full bright cyan
CHSV  mycyan = {145,255,255};
// full bright yellow
CHSV  myyellow = rgb2hsv_approximate(CRGB::Yellow);
// full bright white
CHSV  mywhite = rgb2hsv_approximate(CRGB::White);

// full bright cyan
CHSV  mycyan = {145,255,255};
// full bright yellow
CHSV  myyellow = rgb2hsv_approximate(CRGB::Yellow);
// full bright white
CHSV  mywhite = rgb2hsv_approximate(CRGB::White);

    mycyan.v = mycyan.v *.2;  // set bright
    myyellow.v = myyellow.v *.5;  // half bright
    mywhite.v = mywhite.v *.5;  // half bright

    mycyan.v = mycyan.v *.2;  // set bright
    myyellow.v = myyellow.v *.5;  // half bright
    mywhite.v = mywhite.v *.5;  // half bright