Program to remove leading and trailing spaces in C [rtrim(), ltrim() and trim()]

TrimLibrary.c

#include <stdio.h>
#include <string.h>

/* Originally posted at https://www.tricksumo.com/string-trim-functions-c/
Author Name:- Rishi Tiwari
Site URL:- TrickSumo.com */


char* rtrim();
char* ltrim();
char* trim();


 int main() {

char str1[30]="First       ";
char str2[30]="      Second";
char str3[30]="   Third    ";


printf("[%s]\n",rtrim(str1));
printf("[%s]\n",ltrim(str2));
printf("[%s]\n",trim(str3));
return 0;
    }

// Rtrim () starts from here.

char* rtrim(char a[30])	
   
{

int i=strlen(a)-1;

// We are not considering next line character '\n' because it is already removed.

for (i; a[i]==' '|| a[i]=='\t'; i--) {
 
a[i]='\0';  }

return a; }

//Ltrim() starts from here.

char* ltrim(char b[30]) {

int i=0, j=0;
char ltrim[30]="\0";
 

for(i; b[i]==' ' || b[i]=='\t'; i++);

while (b[i]!='\0') 

{ 
ltrim[j]=b[i];
i++;
j++; }

strcpy(b,ltrim);

return b;

}

// Trim() starts from here.

char* trim(char c[30])	
   
{

rtrim(c);
ltrim(c);
return c;  

}

Hi

This is my first gist on github.

Program originally published at TrickSumo C Blog.

Feel free to ask anything or suggest improvements.

Thanks.