Puzzle S20

Delete each instance of a particular character from a string

[H-10] Write function that shortens a string by removing all instances of a particular character from a string. The null that terminates the string is placed after its new last character. The prototype of the function is:

void deleteCh( char *str, char ch ); 

Remove every ch from str. For example , deleteCh( "applecart", 'a') changes "applecart" into "pplecrt". Here is a testing function:

#include <stdio.h>
#include <stdlib.h>

void deleteCh( char *str, char ch )
{
}

struct test
{
  char str[50];
  char ch;
};

int main(int argc, char *argv[])
{
  struct test trials[] =
  {
    {"aXX", 'a'},
    {"XXa", 'a'},
    {"aXX", 'x'},
    {"a",   'a'},
    {"aa",  'a'},
    {"aaa", 'a'},
    {"bca", 'a'},
    {"bcaa", 'a'},
    {"aaabbbaaa", 'a'},
    {"xaxaxa", 'a'},
    {"XAAxaa", 'a'},
    {"applecart", 'a'},
    {"blue berry", 'e'}
  };

  int j;
  for ( j=0; j<sizeof(trials)/sizeof(struct test); j++ )
  {
    printf( "%s\t", trials[j].str );
    deleteCh( trials[j].str, trials[j].ch );
    printf( "%c\t%s\n",
        trials[j].ch, trials[j].str );
  }

 
  return 0;
}

Attempt to write this function without using a second string as a buffer or by using malloc() to get a buffer.