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# Remove duplicate characters from a string

# Given a string that contains duplicate occurrences of characters, remove these duplicate occurrences.

# For example, if the input string is "abbabcddbabcdeedebc", after removing duplicates it should become "abcde".

# Runtime o(n) and memory O(n)

# this solution uses extra memory

# to keep all characters present in string.

def remove_duplicates(s):

result = []

for item in s:

if item not in result:

result.append(item)

return ''.join(result)

s = "abbabcddbabcdeedebc"

print(remove_duplicates(s))