Question

How to remove duplicate consecutive characters from a string in C

Answer 1

#include <stdio.h>
 
void removeDuplicateCharacters(char *p) { 
    if (p == NULL || *p == '\0') return; 
     
    int check_char = 1, i = 1;
  
    while (*(p + check_char)) { 
        if (p[check_char] != p[check_char - 1]) { 
            p[i] = p[check_char]; 
            i++; 
        } 
        check_char++; 
    } 
    
    *(p + i) = '\0'; 
} 
 
int main()
{ 
    char s[] = "ccc x ppppprooooogggramming x c dddd";
     
    removeDuplicateCharacters(s); 
     
    puts(s);  
     
    return 0; 
}   

  
 
/*
run:
  
c x programing x c d
  
*/

 

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