y cant i merge?

Character.pde

@@ -0,0 +1,61 @@
+void characterChecks() 
+{
+  if (gender == "Male") 
+  {
+    switch(preset) 
+    {
+    case 1:
+      presetVar = "Male_preset1.png";
+      break;
+    case 2:
+      presetVar = "Male_preset2.png";
+      break;
+    case 3:
+      presetVar = "Male_preset3.png";
+      break;
+    case 4:
+      presetVar = "Male_preset4.png";
+      break;
+    case 5:
+      presetVar = "Male_preset5.png";
+      break;
+    case 6:
+      presetVar = "Male_preset6.png";
+      break;
+    default:
+      println("Something went wrong with Male presets.");
+      break;
+    }
+  }
+  if (gender == "Female") 
+  {
+    switch(preset) 
+    {
+    case 1:
+      presetVar = "Female_preset1.png";
+      break;
+    case 2:
+      presetVar = "Female_preset2.png";
+      break;
+    case 3:
+      presetVar = "Female_preset3.png";
+      break;
+    case 4:
+      presetVar = "Female_preset4.png";
+      break;
+    case 5:
+      presetVar = "Female_preset5.png";
+      break;
+    case 6:
+      presetVar = "Female_preset6.png";
+      break;
+    default:
+      println("Something went wrong with Female presets.");
+      break;
+    }
+  }
+  if (gender != "Male" && gender != "Female") 
+  {
+    System.out.println("Uh oh, there's no proper gender selected!");
+  }
+}

Chest.pde

@@ -0,0 +1,21 @@
+class Chest 
+{
+  PVector chest = new PVector(700, 644);
+  PImage chestIMG;
+  boolean open = false;
+
+  Chest() 
+  {
+  }
+
+  void chestDisplay() 
+  {
+    if (chest.x <= Bob.x && chest.x+30 >= Bob.x +10) 
+    {
+      chestIMG = loadImage("Chest Open.png");
+    }
+    chestIMG = loadImage("Chest Closed.png");
+    chestIMG.resize(40, 40);
+    image(chestIMG, chest.x, chest.y);
+  }
+}

GameUI.pde

@@ -0,0 +1,65 @@
+void screenDisplay() 
+{
+  rectMode(0);
+  //Health Display
+  fill(0, 0);
+  stroke(0);
+  rect(10, 10, 200, 30);
+  fill(255, 0, 0);
+  rect(10, 10, health*2, 30);
+  fill(255);
+  if (health>80) 
+  {
+    textSize(health/3);
+    text("Health:" + health+"%", 10, 40);
+  } 
+  else 
+  {
+    textSize(30);
+    text(health+"%", 10, 40);
+  }
+  if (health <= 0) 
+  {
+    gameScreen = false;
+    deathScreen = true;
+  }
+
+  //Level Display
+  textSize(30);
+  fill(0);
+  text("Level: "+level + "/20", 250, 40);
+
+  //Pause Button
+  fill(0);
+  stroke(255);
+  rect(890, 10, 100, 50);
+  fill(255);
+  textSize(30);
+  text("Pause", 895, 45);
+  timer += counter;
+  if (timer >= 10) 
+  {
+    timer = 0;
+    counter = 0;
+  }
+  if (mousePressed) 
+  {
+    if (mouseX>=890 && mouseY<=990) 
+    {
+      if (mouseY>=10 && mouseY<=60) 
+      {
+        if (pauseScreen && timer == 0) 
+        {
+          pauseScreen=false;
+          counter = 1;
+        } 
+        else if (timer == 0) 
+        {
+          pauseScreen = true;
+          counter = 1;
+        }
+      }
+    }
+  }
+  println(counter+ "timer:"+ timer);
+}