Added buffer to the console

Added hotkeys to switch between console buffers and to return to the home one
Added clear screen command
Added debug text outputs to the hello command and when loading sh

screen.c

@@ -5,20 +5,27 @@ int main(int argc, char *argv[]) {
     //int  consoles = 0;
     int pid;
     //char* comment = "";
-
+    
     for (int i = 1; i < argc; i++) {
         if (strcmp(argv[i],  "-c") == 0) {
             
         }
     }
 
-    pid = fork();
+    pid = fork();    
     if (pid < 0) {
         printf(1, "screen: fork failed\n");
     }
     if (pid == 0) {
-        exec("sh", argv);
-        printf(1, "screen: exec sh failed\n");            
+        if (screen() != 0)
+        {                        
+            exec("sh", argv);                        
+            printf(1, "screen: exec sh failed\n");            
+        }
+        else
+        {
+            printf(1, "screen: failed to create a new console\n");
+        }
     }    
     exit();
 }