The local transport authority is organizing an online picture contest.
Participants must take pictures of transport means in an original way, and then post the picture on Instagram using a specific ```hashtag```.

The local transport authority needs your help. They want you to take out the ```hashtag``` from the posted message. Your task is to implement the function

```python
def omit_hashtag(message, hashtag):
```

## Examples 

```
* ("Sunny day! #lta #vvv", "#lta") -> "Sunny day!  #vvv" (notice the double space)
* ("#lta #picture_contest", "#lta") -> " #picture_contest"
```

## Notes

* When multiple occurences of the hashtag are found, delete only the first one.

* In C, you should modify the ```message```, as the function returns a void type. In Python, you should return the answer.

* There can be erroneous messages where the hashtag isn't present. The message should in this case stay untouched.

* The hashtag only consists of alphanumeric characters.

Difficulty: introductory

Starter code:

def omit_hashtag(message, hashtag):
	

Solutions:
def omit_hashtag(message, hashtag):
    return message.replace(hashtag, "", 1)

omit_hashtag = lambda message, hashtag: message.replace(hashtag, '', 1)

def omit_hashtag(message, hashtag):
    return message.replace(hashtag, '' , 1) if hashtag in message else message

omit_hashtag = lambda m, h: m.replace(h,"",1)

def omit_hashtag(s, c):
    return s.replace(c,"",1)

def omit_hashtag(s, hashtag):
    return s.replace(hashtag, '', 1)

import re

def omit_hashtag(message, hashtag):
    return re.sub(hashtag, '', message, count = 1)

def omit_hashtag(message, hashtag):
    index = message.find(hashtag)
    if index == -1:
        return message
    else:
        return message[:index] + message[index+len(hashtag):]
    



def omit_hashtag(message, h):
    return message.replace(h,'',1)

# Return the message, but with the first occurrence (if any) of the
# specified hashtag removed from the message
def omit_hashtag(message, hashtag):
    if hashtag in message:
        found_at = message.index(hashtag)
        return message[0:found_at] + message[found_at + len(hashtag):]
    else:
        return message