Fixed Printing of Escape Sequences

[gptsarthak]

Fixes #1473
Modified LPython semantics, C and Julia backend so that they do not print the backslash even after it is recognized.

When asked to print the following string:

s: str
s = 'I said \'Wow\' '
print(s)

LPython now prints:
I said 'Wow'

[certik]

I checked against CPython and this change seems to be correct.

[certik]

I think this looks good, thanks for fixing it! I left some minor formatting comments.

[certik]

Thanks @gptsarthak for the fix!

[faze-geek]

The obvious edge case to be checked here was for " " instead of ' ' :)
Just as I was writing this comment the PR was merged.

def main():
	print("I said \"hi\" ")

main()

(lp) C:\Users\kunni\lpython>python try.py
I said "hi"

(lp) C:\Users\kunni\lpython>src\bin\lpython try.py
I said \"hi\"

@gptsarthak Shouldn't be difficult to add this. Thanks !

[gptsarthak]

Hey @faze-geek thanks for pointing it out! Now that this PR is merged, should I make another PR after adding it?

[faze-geek]

Hey @faze-geek thanks for pointing it out! Now that this PR is merged, should I make another PR after adding it?

Yes, you can do that!
I noticed you made the changes from your main. It's better to always make a new branch instead.