title: I need to use a function in order to get a return instead printing the output
body: <p>A catering company has hired you to help with organizing and preparing customer's orders. You are given a list of each customer's desired items, and must write a program that will count the number of each items needed for the chefs to prepare. The items that a customer can order are: salad, hamburger, and water.</p>
  
  <p>Write a function called item_order that takes as input a string named order. The string contains only words for the items the customer can order separated by one space. The function returns a string that counts the number of each item and consolidates them in the following order: salad:[# salad] hamburger:[# hambruger] water:[# water] </p>
  
  <p>If an order does not contain an item, then the count for that item is 0. </p>
  
  <p>Notice that each item is formatted as [name of the item][a colon symbol][count of the item] and all item groups are separated by a space.</p>
  
  <p>For example:</p>
  
  <p>• If order = "salad water hamburger salad hamburger" then the function returns "salad:2 hamburger:2 water:1"
  • If order = "hamburger water hamburger" then the function returns "salad:0 hamburger:2 water:1"</p>
  
  <p>This is the code so far:</p>
  
  <pre><code>s = '"hamburger water hamburger water salad "'
  #The value of s will be received by the user only with the options in s
  
  subs = 'salad'
  
  count =0
  flag=True
  start=0
  while flag:
      a = s.find(subs,start)  
  
      if a==-1:          
          flag=False
      else:               
          count+=1        
          start=a+1
  if count==0:
      salad="salad:0"
  else:    
          b=str(count)   
          c=subs+':'
          salad=c+b 
  
  
  subs = 'water'
  
  count =0
  flag=True
  start=0
  while flag:
      a = s.find(subs,start)  
  
      if a==-1:          
          flag=False
      else:               
          count+=1        
          start=a+1
  if count==0:
      water="water:0"
  else:      
  
          b=str(count)   
          c=subs+':'
          water=c+b 
  
  
  
  subs = 'hamburger'
  
  
  count =0
  flag=True
  start=0
  while flag:
      a = s.find(subs,start)  
  
      if a==-1:          
          flag=False
      else:               
          count+=1        
          start=a+1
  if count==0:
      hamburger="hamburger:0"
  else:
          b=str(count)   
          c=subs+':'
          hamburger=c+b 
  
  
  print salad,hamburger,water
  </code></pre>