Vim ways of adding a character to the end of the line

Ok, so in these annoying little languages that require a ; at the end of the line or they piss and cry, how can I add that easily? I mean in situation when I finish writing my code and the cursor isn't at the end of the line, like when you have a function or a string that pair () "" is added automatically so your cursor ends up before those characters like in the picture, how do I add the ; at the end of the line in the easiest way?
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