Summary: In this programming example, we will learn to remove all duplicate characters from the string in C.

To remove all duplicates characters, we have to check for each character whether it occurs more than once in the given string, If so, we remove all its occurrences except the first one.

For example, the word ‘popeye‘ contains multiple p and e, as a result, we keep the first occurrence of each of them and remove their duplicates correspondent.

The string after the elimination of duplicates would become ‘poey‘.

In programming, to eliminate a duplicate character we move all the characters to the left on the right.


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In our program we first find the duplicate character then we delete it by transferring all subsequent characters to one step left.

In this tutorial, we learned how to remove the duplicate characters from the given string in the C programming language.

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