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" this is a test  "
"this is a test"

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

void my_trim(char *s, unsigned int len)
{
    char *b = s;
    while ( len > 0 && isspace( (unsigned char) s [len - 1] ) )
        len--;
    while ( len > 0 && isspace(*b) )
    {
        b++;
        len--;
    }
    memmove(s, b, len);
    s[len] = '\0';
}

int main()
{
    char s[]="   this is a test     ";
    unsigned int len;
    len=strlen(s);
    puts(s);
    my_trim(&s,len);
    printf("After trimming : %s\n",s);
    return 0;
}

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trim.c: In function ‘main’:
trim.c:24:9: warning: passing argument 1 of ‘my_trim’ from incompatible pointer type [enabled by default]
         my_trim(&s,len);
         ^
trim.c:5:10: note: expected ‘char *’ but argument is of type ‘char (*)[23]’
     void my_trim(char *s, unsigned int len)
          ^

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my_trim(s, len);