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#include <stdio.h>
#include<string.h>
 
void RemoveDuplicates(char* str)
{
    int a = 0,j,i = 0,k;
    while(str[a] != '\0')
    a++;
    while(str[i] != '\0')
    {
    	j = i+1;
    	while(str[j] != '\0')
    	{
         if(str[i] == str[j])
          {
          	k = j
          while(str[k] != '\0')
          {
           str[k] = str[k+1];
           k++;
          }
          a--;
    	}
          else
          j++;
    }
    printf("%s",str);
}
int main() {
	//code
	int a;
	scanf("%d",&a);
	for(int i = 0;i<a;i++)
	{
	    char str[i][50];
	    scanf("%s",str[i]);
	    RemoveDuplicates(str);
	}
	return 0;
}

prog.c: In function 'RemoveDuplicates':
prog.c:17:11: error: expected ';' before 'while'
           while(str[k] != '\0')
           ^
prog.c:29:5: warning: 'main' is normally a non-static function [-Wmain]
 int main() {
     ^
prog.c: In function 'main':
prog.c:37:23: warning: passing argument 1 of 'RemoveDuplicates' from incompatible pointer type [-Wincompatible-pointer-types]
      RemoveDuplicates(str);
                       ^
prog.c:4:6: note: expected 'char *' but argument is of type 'char (*)[50]'
 void RemoveDuplicates(char* str)
      ^
prog.c: In function 'RemoveDuplicates':
prog.c:40:1: error: expected declaration or statement at end of input
 }
 ^
prog.c:6:23: warning: variable 'k' set but not used [-Wunused-but-set-variable]
     int a = 0,j,i = 0,k;
                       ^

Standard output is empty