void what3 (char sentence[]){

char first[MAX_SIZE];
int i, j, len, len1;
len = strlen(sentence);
for(len1=0; sentence[len1]!=' '; len1++);
for(i=0;i<len1;i++)
first[i]=sentence[i];
first[i]='\0';
for(i=len1+1, j=0; i<len; i++)
sentence[j++] = sentence[i];
sentence[j]=' ';
sentence[j+1]='\0';
strcat(sentence,first);
}