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void spacing(char* str)
{
int read, write;
read = write = 0;

while(str[read])
{
//copy till a white space has been found
while(str[read] != ' ' && str[read])
{
str[write++] = str[read++];
}

//on a whitespace
if(str[read] == ' ')
{
str[write++] = str[read++];
}

//keep incrementing read till no more white spaces are found
while(str[read] == ' ' && str[read])
{
read++;
}

}
//Null terminate
str[write] = '\0';
}

char * removeExtra(char *str)
{
if(str==null)
return str;
int space=0,writePtr=0,i=0;
while(str[i]!='\0')
{
if(str[i]=='\0')
{
space++;
}
else
space=0;

if(space<=1)
{
str[w]=str[i];
w++;
}
i++;
}
str[w]='\0';
}

#include <iostream>

char *rpl_mult_spaces(char *input);

int main()
{
char *result=rpl_mult_spaces("aaa bb c d");
printf("%s",result);
return 0;
}

char *rpl_mult_spaces(char *input)
{
int len=strlen(input);
char *p=input;
char* dest=new char[len];
memset(dest,'\0',len);
char *q=dest;

int i=0;
while(i<len)
{
if(*p!=' ')
{
*q=*p;
p++;
q++;
i++;
}
else
{
while(*p==' ')
{
p++;
i++;
}
*q=' ';
q++;
}
}
return dest;
}

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

int main(void){

char a[100] ;
int i , j ;
i = j = 0 ;
printf("Enter the string\n") ;
fgets(a,sizeof(a),stdin);
a[strlen(a) -1 ] = '\0' ;
while(a[i] != '\0'){

while(a[i] != ' ' && a[i] != '\0'){
a[j]=a[i] ;
i++ ;j++;
}
a[j]=a[i] ;j++ ;
while(a[i] == ' ' && a[i] != '\0') i++ ;
}

printf("New string:%s\n",a) ;
}

void replaceExtraSpace(char* str){
int i = 1;
int j = 0;
if(strlen(str) == 0) return;
while(str[i] != '\0'){
if(str[i] != ' ' || str[j]!= ' ')
str[++j] = str[i];
++i;
}
str[++j] = '\0';
}

int i=0,j=0;
int n = strlen(str);

while(i<n){
if(a[j]!=a[i]){
j++;
a[j]=a[i];
}
i++;
}
a[j+1]='\0';

void remove_extra_space(char* str){
  char *removedPtr = str;
  while(*str){
    if(*str == ' ')
      *removedPtr++ = *str++;
    while(*str == ' ')
      ++str;
    *removedPtr++ = *str++;
  }
  *removedPtr = '\0';
}

btw: if you guys could put the code inside

, it makes reading much easier

Courtesy of Python:

def remove_mult_spaces(s):
    return ''.join(w + ' ' for w in s.split() if w is not '').rstrip()