Goes Right After (simplified)
In a given string you need to check if one symbol goes right after another. If so - return True, otherwise - False.
If one of the symbols is not in the given word - your function should return False. If two seeking symbols are the same - your function should return False.
Input: Three arguments. The first one is a given string (str), second is a symbol (str) that should go first, and the third is a symbol (str) that should go after the first one.
Output: A logic value (bool).
Examples:
assert goes_after("world", "w", "o") == True
assert goes_after("world", "w", "r") == False
assert goes_after("world", "l", "o") == False
assert goes_after("list", "l", "o") == False
Preconditions: all symbols are lowercased and unique.
